My 70's and 80's GM trucks had the steel plugs. When I was in my local chain parts store and asked for rubber brake adjustment plugs they didn't have a clue, didn't even have any hanging on the Dorman peg display.


1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy