Please help! Wheel issue.

[Burg Boxster]

well, you do want nice stuff in the way of spacers, otherwise you could easily get vibrations from bad balance.

What is the offset on the rims (it'll say on the rim right after the width)?

Then you can either calculate it yourself using Mike Focke's explanation and link (http://mike.focke.googlepages.com/willthosewheelsyouwantfit%3F), or call wheelenhancement.com for assistance.

For the spacers.... again try wheelenhancement or:

allsprings.com
autoanything.com
boothedesign.com

Prices will vary greatly, but definitely get hubcentric spacers and the longer wheel bolts needed.

Good luck

[Cloudsurfer]

If those wheels came off a C4S they are likely 18x11 and thus will not fit- with or without spacers. Ideally you want 10" wide with an offset around 45mm. Most 996 rears are 10" ET65, so you would need a 20mm spacer. If you go this route, be aware that it does increase stress on the hub assembly, and always use a hubcentric spacer and longer bolts as needed.

Patrick