Seat heating element part numbers.
 

I finally was able to get to the shop and get part numbers for the heating elements to use when you replace covering on seats with new ones. They are from a 2003 Silverado if I recall correctly. You may be able to find some salvage but, as hard as the covering is to come off I would look at putting in new ones.

Back #'s
88940310 R
88940289 L

Seat cushion #'s:
88940288 L
88940309 R

Good Luck!!

TAZ