I’ve been looking at brake drums for my 1962 special wagon on rockauto and they all have 5 lugs yet my car has 4, parts aren’t easy to get here in the uk so don’t want to be ordering the wrong stuff!!
Your asking that question in the wrong group, most people here don't have a clue. We have a Facebook group for the 61-63 Y body Buicks with over 1400 members currently. Lots of good information to be had if you're interested. Keith