The only reason to buy spacers is to allow more clearance between the suspension and brakes for the wheel. The need generally arrises when someone uses wide wheels witht he incorrect offset.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>