Mustang Accessory Sill Plate (1964-1968) Installation Instructions

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1964-1968 Mustang Accessory Sill Plate

This Accessory Sill Plate will fit 1964-1968 Mustangs.

After installing new sill plates, the painted area between them and the outer rocker panel still might be looking unfinished. Add these Accessory Sill Plates to your 1964-1968 Mustang and give that area a great finishing touch!

This Install Also Applies To:

• Mustang Pr Accessory Sill Plates 1969-1970

Tools Required:

• Drill & Drill Bit
• 3M Adhesive

Install Difficulty:

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• Easy Project

1. To start installing your new Mustang accessory sill plate, open the door (I did the drivers side first) and loosen the screws on the factory sill plate, about a half turn, so the heads will not stick up and scratch the bottom of the door.

2. Turn the accessory sill plate over and apply 3M trim adhesive. I used a about a drop that was the size of a half a marble at six inch spacings.

3. Slip the Mustang sill plate under the door sill and position it so it is even along the outer edge.

4. Tighten the screws on the Mustang door sill plate. Close the door and let the adhesive set.

5. Repeat on the other side. For this side, I applied the adhesive spaced further apart and with a larger marble size amount. When the accessory sill plate was placed on the Mustang, I had to clean up some excess adhesive that came out when I tightened the screws on the Mustang sill plate.

6. The next morning, I drilled 3/32” pilot holes for the Mustang accessory sill plate screws, which will be placed through the door sill using the holes in the accessory sill plate as a guide. Be careful when you tighten these screws, as you don’t want to strip them out or over tighten.

7. Now you are all done installing your new Mustang accessory sill plate, which is a nice easy project that makes dramatic change.