Found a pretty interesting read over at clubgp:
Shorter endlinks for lowered cars??
Cliffnotes: Because a lowering spring actually makes your control arm sit at an angle to the ground, the spacer in the endlink should be removed and replaced with a few washers to allow the sway bar to sit level again.
Anyone have any thoughts on this? Only reason I ask is because one of my endlink bolts are stripped, and I need to get a new one. But if I should be running without the small spacer, I should also be running a shorter bolt, hence why I am inquiring before I purchase.