Lucille The new ones i have here are aprox .278 thik and are bonded.This is just the lining.mine wher done at OTT'S Friction Supply, Portland Oregon. The original lining was rivited and .187 thick . You should check you're drum diameter.As far as how thin the lining can get YOU'RE CALL. But new lining is cheep as compared to new/ used drums. I do not know how over thick/ size they can go. go here - http://chevy.oldcarmanualproject.com/index.htm. Much good info.