I just thought about it but if the RC lift is anything like my old 2 inch BDS spacer lift you won't need bump stop spacers. The actual lift spacer mounts on top of the cool and acts like a bump stop spacer pushing the bump stop down farther. I'm running bump stop spacers because I swapped out the spacer lift with longer coils and when initial installed you put the bump stop back in the factory location. But since the coils are longer you really need to add a bump stop spacer especially when running 33s