Ford F100,150,250,350,Bronco,Econoline E100&300 '70-'76 LockingGasCapStant G752. This cap has a NAPA Box and Black Ring on top with a NAPA Number. Also on the Box is the Stant Number G752.Stant made all of NAPA's Caps for years. The only difference is the black ring & part number.I worked for Stant for 33 years so, I know this.There is a Complete Applicatio 7 size Chart in the Photo Section of my listing.These lists are from the 1984 Stant Catalog.This is a New Old Stock Locking Gas Cap with 2 Keys.Thanks, Jack