Help. I am trying to find the correct size bump stop for a 2005 silverad 1500 4x4 hd LS. There are several sizes . The truck has the original on it now.

 

Take your VIN to the dealer parts department (Or on an online GM parts store) and they'll tell you exactly which one you need. When I replaced the struts on Suburban, there were dozens of different part numbers. After entering the VIN, there was only 1 and it was $8. The one we thought it was was $40. Glad I didn't buy it.