I've never seen pre-made leather seat covers for a Crossfire. You'd need to take the seats to an auto upholstery shop to have custom leather seat covers made. I suspect that would end up being pretty expensive. You might want to consider buying a pair of leather Crossfire seats from a salvage yard . . . For example . . .

http://www.ebay.com/itm/04-Chrysler-Crossfire-black-gray-leather-heated-power-seats-/271646020667?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f3f5d543b&vxp=mtr
Lots of choices currently on E-Bay . . .