I've Googled for cold air intakes (the sticks with air filters attached, in case I've got the wrong name) for about an hour now, but all the sites don't have any Bonneville air intakes. I see a lot of Grand Prixs, Firebirds, Sunfires, Sunbirds, GTO'*... but no Bonnies. Where did you guys buy yours?

There really isn't anything specific to the Bonnies out there as far as intakes go. The cheapest option would be the rice pipe intake. There is a big thread about this in this section that you should check out. You can also fab up a Thrasher or SLP CAI. Those are both very good intakes as well, but they are much more money.

Well, I guessed that the Grand Prix intakes might work on the Bonnevilles (same engine IIRC). But for about $100 and my bad luck, I wasn't going to gamble.

The intakes for the W-bodies won't fit perfectly, so you'll have to do some custom work. People have been sucessful with the rice pipe here though.

get a rice pipe and a K&N filter, then build a heatshield