Most all of the rear wheel drive Cadillacs from 1996 back are 5x5. The full size rear wheel drive station wagons are nearly always this size. The largest Buick's like the Park Ave had the big pattern. Oddly, the LeSabre which was only a couple of inches shorter had the smaller bolt pattern. The same was true at Oldsmobile. The Old's 98 had the large 5x5 pattern, the olds 88 had the smaller bolt pattern. Caprice cop cars had the 5x5 pattern as well.

On these GM cars, the larger bolt pattern was used on cars with the 12 inch front brake rotors. The cars with the 11 inch rotors used the 4.75" bolt circle.

Edit: I should have mentioned, the above information is for the 1977-96 model cars. I know the 5x5 and the 5x4.75 patterns were used prior to 1977, but am unsure which cars used it.