I know Trigo wheels only come in 1 offset, 3-1/2" they don't make custom offsets. Is the distance from the face of the hub to the end of the threaded part different from front to back? I think they should be the same. The only other thing i can suggest is call George and ask him or Ryan @ Lesher Motorsports who bought Upstates/Contemporary's Daytona Coupe business and uses these parts.
http://www.leshermotorsports.com/pro...uspension.html