Worked in the shop and on the computer last night. The steering wheel interface to the paddle shifter is 4.75" in diameter. That's exactly an 1" bigger then the first plate I made. I remodeled the plate and added a big chamfer around the perimeter where it mates to the shifter unit.
http://images40.fotki.com/v697/photo...COLUMN6-vi.jpg
http://images59.fotki.com/v1640/phot...COLUMN5-vi.jpg
The new, smooth shroud will be made out of an exhaust pipe reducer. 4" to 3 1/2" will work perfect. I'll be hitting the muffler shop tonight to see if they have any that size.