Welcome to the forums!
It is in the wrong section (thread) but no problem. The moderators can move it.
For the future - go to the "Forums" tab at the top of the page, scroll down and select a category that is most appropriate. You'll see repair, fun and games, full timing, etc. If I recall, there is also a "How to" forum that will answer questions for you about forum use.
To answer your question. You can either replace or most likely yours is rebuildable. "InlandAndy" (Forums name) carries a lot of parts, give him a shout.
Good luck, Dave
"Wimpy" 1/2 ton 2002 GMC Sierra 4X4 Z-71 Gasser
2000 Safari SS 25'