with this offset, what size adapter would i need.
 

Ok, I want to go here:

http://cgi.ebay.com/ebaymotors/ws/eB...946169375&rd=1

to get bolt adaptors for these wheels:

http://www.tirerack.com/servlet/Call...pecial=Pricing

Incase you don't want to open a window here are the wheel specs:
Size Selected: 16x7.5
Estimated Availability: 03/31/05
Recommended Tire Size: 205/50-16
Wheel Offset: +42mm
** Lightweight: 20.0 lbs. **
Bolt Pattern: 4-100
Finish Warranty: 1 Year
Country of Origin: South Korea
Construction Type: LP Cast/Shot Peened

Think an adapter can be made to make them fit?