Part # might help you.. I believe its 05102297AA

SPRING. Front Coil. Front Coil. Suspension, Front. 2008 CHRYSLER CROSSFIRE # 05135480AA, 05102297AA

0510 2297AA,MERCEDES-BENZ 05102297AA Coil Spring for MERCEDES-BENZ

05102297AA - Chrysler OEM Part Number - 05102297AA

The prices vary for those and I would double check the application


for used parts, this site is pretty good:

Car-Part.com--Used Auto Parts Market

it won't let me link the search results but should be pretty self explanatory