Mustang Deck Lid Molding (1967-1968) Installation Instructions

Tools Required:
  • Ratchet
  • 7/16-inch Socket or Wrench
  • 5/16-inch Socket or Wrench
  • Drill
  • 3/16-inch Drill Bit
  • Tape Measure
  • Small Metal File Set
Install Difficulty:
  • Easy
  • Easy Project
1. The ideal time to initially install your new Mustang Deck Lid Molding and any other molding pieces is before the car is painted, if you are in the position to do so. Doing the initial fit now will ensure you can make all the adjustments at this point in time so it will be a direct fit after your car is painted, reducing the potential to scratch the new paint, especially if holes are to be drilled. Plus, the molding is easy and fast to remove once the pre-painting installation is complete. Here is my 1967 coupe with a reproduction trunk deck (3649A) with no holes, and original quarter extensions with molding holes.
Mustang Deck Lid Molding Install Image
2. Before installing the new deck lid molding, the Mustang Quarter Extension Moldings are going to be installed. Here is a picture to show where the factory holes were if your quarter extensions do not have the holes already in them. If you are drilling new holes, use a 3/16-inch bit.
Mustang Deck Lid Molding Install Image
3. Remove the quarter panel extensions. Use a 7/16-inch nut driver or deep well socket to remove the nuts, which are accessible from inside the Mustang trunk. There are a total of three nuts to remove.
Mustang Deck Lid Molding Install Image
4. It is a good idea to hold the molding up to the quarter panel extension to see how it is going to fit. Three new mounting studs are included with the new Mustang quarter panel moldings. Slide them into the back of the molding, starting at the ends of the molding. The corners of the molding tracks may need bent slightly with needle nose pliers to help get the mounting studs started in the track.
Mustang Deck Lid Molding Install Image
5. Carefully slide the studs along the track until they are close to their final position. It is at this point where you will bend the molding if you're not careful. There are two easy ways to slide the studs down the track: Put the stud in a bench vise to hold it stationary while gently sliding the molding to get the stud into place, or remount the quarter extension and put the stud in one of the holes as shown below to hold it stationary so you can slide the molding with both hands.
Mustang Deck Lid Molding Install Image
6. Then check the studs for alignment with the holes.
Mustang Deck Lid Molding Install Image
7. Secure the moldings to the extensions with the supplied nuts, using a 5/16-inch nut driver or socket. Do not over tighten!
Mustang Deck Lid Molding Install Image
8. The quarter extension moldings are now installed. The Mustang quarter panel extensions can be reinstalled.
Mustang Deck Lid Molding Install Image
9. As with the quarter extension moldings, it is a good idea to hold the molding up to the trunk lid—or tape it into place—to check for proper fit as well as its alignment with the quarter extension moldings.
10. This reproduction trunk deck did not have predrilled mounting holes for the Mustang exterior moldings, so I had to drill them myself. Nine mounting studs came with the trunk deck molding. I marked two holes on each of the far ends of the trunk and used a tape measure to evenly space the remaining holes on the trunk lip that drops down. Do not do like I did and put a hole right in the center of the trunk lip as there is no track in the very center of the molding. After the hole locations are marked, check them against the molding to make sure there is nothing in the molding track that will interfere with a stud in that location. The center of the hole was measured 5/16” up from the bottom of the trunk lip.
11. When you’re sure of your hole locations, begin drilling into your Mustang trunk lid with a very small drill bit size to make a pilot hole. Tip: if you have a small section of hose available (brake hose is perfect), cut about 1/4 to 1/2-inch section of hose and set it over the drill bit. This keeps the drill from hitting the trunk lid hard after the drill bit breaks through.
Mustang Deck Lid Molding Install Image
12. With all the pilot holes drilled, use a 3/16-inch bit and drill the final hole. Use a small file to file metal barbs from the hole if they are present.
Mustang Deck Lid Molding Install Image
13. Slide the studs into the track on the back of the molding as was done with the quarter extensions. Since the deck lid molding is much longer and flimsier, securing the stud in a bench vise worked better to move the studs down the track. Be extremely careful during this step to not bend or distort the molding.
14. Do a final adjustment of the studs, install the molding, and secure it into place with the 5/16-inch nuts on the back, as with the quarter extension moldings, taking care to not over tighten.
15. The new Mustang Deck Lid Molding is completely installed. This molding follows the contour of the trunk very well, is the right width, and lined up perfectly with the quarter extension moldings. I was very happy with the quality, plus it looks great.
Mustang Deck Lid Molding Install Image
Mustang Deck Lid Molding Install Image