Thanks everyone for the suggestions. The drum is a 5 4 3/4 bolt pattern, probably should have mentioned before so that everyone didn't have to waste anytime. I ended up doing a bunch of leg work which seems pretty typical with this old truck, seems like a going theme on this message board in fact. Part of the fun huh? Anyway, it turns out this drum is from a Chevy car, bel air or biscayne to be exact. Around 67-68 per the dimensions of the thing. I am crossing my fingers In hopes that's the one I ordered from summit is the right one. Ready to have some forward progress on this suspension/ front end/brake job.