The guy at O’Reilly ordered the 6239 and it was larger than the “correct” part number, but still no resistance when I pushed it up thru the hole.It looks like there are two different parts.... Moog also has a K6293 that's listed on Rockauto for an 88 C1500. Unfortunately, I'm not seeing diameters.
And correct, I have not seen that measurement on parts websites on on a store’s system either.