that list isnt that good, the years are all over for listed groupes.
both the cars you listed should be 5x 4.75 Some big cars BOP were 5x5 I’ve heard, but never had one. Just had the reguarl pontiac rally IIs on (14x6 and 15x7). The only other pontiac setup it might be was 8lugs. that was only till like 67 on the big cars, and was a rare luxury setup. (really heavy, like a 2piece wheel to the drums). But sence you got them form the trunk, and not even off the car there probally not even rioght anyway. Did you see if the car had 4 wheels on it still? this was a Jyard I asume?