It's a piece of cake. 30 min job. Plastic is on the metal slide where the window bolts at the bottom. Check the FAQ for a picture. Replace the whole regulator. Make sure you detach the window from the regulator to remove from the door.
stock 1998 silver frost SVT E0 #1545 out of 6535
* K&N drop-in air filter
* DMD
* Koni's w/ stock springs
* Autolite double platinum
* Tranny cocktail
* Mobil 1 Snyth Oil @ 60K miles