I have a 97 SSEi and I'm not 100 percent sure on how many mounts I have in there. I've heard a couple different numbers. But so far I've only found the front trans mount, the passenger side motor mount, and a slightly bowed mount with two rubber bushings. I feel kinda stupid having to ask that question but it'* driving me nuts. I have the haynes manual but it doesn't cover supercharged models. I also have the two huge books from GM on all Bonneville models but they don't specify very well either. Any help would be appreciated. Thanks!

1997 Pontiac Bonneville - GM00003301 Engine & Transmission
To me it looks like there is 4 they are numbers 1, 11, 15, and 21

Ok. That was exactly what I needed. I bookmarked that site as well. Thanks a ton. I looked all the parts up on Rockauto and I can replace all of the mounts for 77 bucks! Thanks again

Your welcome.