I tried looking up the part numbers for an 88 c-1500. I read on other pages that the part number from NAPA is 38872 for the front, and 4138068 for the rear. I went on their website and looked it up by application and came up with LF 4138620, RF 4138621, RR 4138624. The other numbers appear to be good numbers, but maybe they changed the numbers? I am unsure. Any help would be greatly appreciated!!!!!!!!