Washer pump part number

Hey.. someone can help me with the rear wiper washer pump part number. I have mine damaged, and i want to order one by the web, so i need the part number.

My truck is a 2000 6 cyl v4.3 vortec.

thanks
earp

Try http://www.gmpartsdirect.com and go to the parts catalog link on the page.
You can scroll down to the part you need and it will give you the part number. Their prices are much better than the dealer, also.
The rear washer pump is under "collision" , "door", "rear gate".
The part number is 22127573.

They are both the same # on the fluid reservior with one upper and one lower mounted - easily replaced with the air filter housing out and about $10 at any parts store so the postage will probably cost more to order.