This package is wonderful...for the price you get all of these sensors, as Ford parts....just the solenoids alone go for $46 a piece at the dealer...(I know because I lost one before I had the chance to install them. These are the newer redesigned solenoids that ford used on later 4X4 actuators on trucks. They are redesigned, as every 80s and 90s vintage original I've seen is cracked and siezed due to water ingress. Plus the cheap chain parts store brand of O2 sensor is going to run you at least $20-$25 each. This kit lets you replace all of the common sensors at a fraction of the price.
I can't figure out what is supposed to come in the box; it does not come as pictured, it did not have the relays and the BAP. They should at least give you the part number of the missing items........