replacing bellow on a polaroid 180

hi guys, hope you can offer some advice.

i bought a polaroid 180 on eBay but the bellow has completely sunk in on one side, so i'm getting a black blob on all my photos.

I've been doing some research and found that you can just replace it with a bellow taken off another polaroid land camera.

My question is; does it have to be a specific polaroid land camera? or will any old one do? they're all the same, right?

many thanks