Here is my .02
The motor is a 3.2 in the slk configuration
The trans slk
Front suspension slk
Hvac slk
Rear slk
Brakes slk
Of course any body/interior/trim/glass/wheel changes will require specific new parts.
The crossfire is more slk then anything else.
Of course the crossfire is its own entity but lets not deny where its engineering came from.