Originally Posted by LPMM

You can get the spacers from ECS tuning which is a forum sponsor or any other place. H&R makes a complete set with everything you need.

I don't run any and the rear looks a little funny since the wheels are really tucked in there. OTOH, it keeps the crud where it belongs.

Here is a pic from LeMansX5 with 87 reps and no spacers (mine look tucked in like that)