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I think you're talking about the black seal that surrounds the glass on the exterior side or the edge that meets up flush with the roof when the glass is closed? If so, it's not available anymore. The GM part # is 12392898. Not sure of any aftermarket kits being out there but then again, I haven't looked that hard into it. I would start with your local glass shop and see if you find some answers there. This is what I would do if it were my car and situation.

We're debating over the definition of "failed". If an O2 sensor isn't sending CORRECT information, I say it's failed. Lazy = failed. If an O2 sensor isn't sending ANY information, you say it's failed. My 88 K1500 would set a "lean" code at highway speed. I had adequate rich/lean indication up to about 55--65 mph depending on load/wind direction. Good cross-counts at idle and off-idle, cross-counts reducing as the speed increased. I went nuts on and off for two years trying to figure-out why the truck went lean on the highway. Fuel pressure was good, AIR pump diverted to the air cleaner in closed-loop...and stayed there exactly as designed. Intake gaskets not leaking, no sign of vacuum leaks anywhere. In desperation, I pulled out the O2 sensor, replaced it with a fresh one. About the same cross-counts at idle and off-idle...but it didn't go lean at higher speed. No more lean codes. Problem solved from that point on. To me, that's a failed O2 sensor. To my shame, I screwed-around now and again for two years playing with injector cleaning, fuel pressure, and re-running all sorts of tests on the emissions controls and ignition system because I didn't pitch a (at that time) $13 one-wire O2 sensor in the trash. My experience is that a failed O2 sensor will generally report false-lean conditions, driving the computer into rich-command, affecting fuel economy and potentially driveability. I have not seen an O2 sensor fail and deliver rich signal, driving the computer into lean command...but I suppose it could happen.

Probably? it may be a more power assisted feel or have a slightly different number of turns lock to lock. I assume you're asking as its a cheap or free option. without checking interchange my opinion is that it will likely work.