Whats the difference?

[mp3deviant721]

The 2 ProComp lift kits on this page:

http://www.trsfabandoffroad.com/products/procomp_suspension.htm

I am looking at the kits with the parts numbers of EXPK4126B & EXPK4124B. Theres a $10 difference between them and I want to know what is different between them. Can anybody help me? Thanks.

 

[Joe_Roofer]

Rear blocks are 1" different. 2.5" or 3.5"

 

[mp3deviant721]

Oh. I didn't see that. Thanks.