I just bought NFL QB Club 96 for the Genesis for 99 cents at goodwill. The case holds a 32X game nearly perfectly. I know Acclaim was the only company to make dedicated 32X clamshell cases, but this is a regular Genesis game. The notches on the top and bottom of the case bow out slightly when a 32X game is inserted, but it still fits quite nicely, while a regular Genesis game is secure, but just a little loose. The NFL QB Club game that came in the case is a standard size cartridge.
It seems like Acclaim made a hybrid case late in the 16 bit era that would fit both regular and 32X games, while not being dedicated completely to either. This hybrid case is noticeably different from the dedicated 32X case than my NBA Jam TE came in.
I guess I'm going to have to keep my eyes open for more of these. I always buy cheap complete Genesis games just for the cases, but now I know that there are some that are more versatile than I thought.

