Help measuring bolt pattern

When my Dad was alive, he actually used small pattern older A body wheels "I think" on the rear of his Dad's K car, so this was a "reversed" situation. I do remember him mentioning that he tightened down two or three lugs and then the next one "seemed off." Most of this was low speed driving around town.........in fact Gramps eventually ran a stop sign and got seriously T-boned in that car, and that was the last day he drove anywhere