I'm pretty sure they're bolted in ... but it doesn't look like a real easy task from what I remember -- I put new vent windows in earlier this year and was planning on putting new springs in the window regulators at the same time ... but I decided to skip it -- it must've looked like a real pain in the butt or I would've done it.
My passenger-side window was drifting down about a half-inch ... I'd crank it up, then after about an hour of driving, it would come down, so I was gonna put new springs in the regulator. Then, like I said, I decided to skip it, and after putting the new vent windows in, both windows are nice and tight and the passenger-side stopped coming down.
