I was shocked to see 2 separate pairs of these on Hawks website. Which one will i need for 17" wheels. I bought the smaller version previously, not knowing there was another. Here are the links to the ebay sales, I couldn't save the pics or I would of posted them that way.

Here is the set I have currently...
http://www.ebay.com/itm/380933479629...84.m1423.l2649

Here are the newly discovered ones...
http://www.ebay.com/itm/291173676081...84.m1423.l2649

 

Neither.
Your stock bumpstops will work perfectly fine with 17" wheels.
The cars equipped with the spacer got shorter, stiffer bumpstops that were the same length as the stock bumpstops thanks to the spacer.

 

Have you bought these yet? I could sell you some off a 3rd gen for about $40 that will practically last you forever. We have a pick and pull yard here and every forth gen you look at, the bump stops are either gone or rotting. The ones on third gens still look pretty new. Dont know why GM changed materials but they sure shouldn't have.