987 & 986 steering wheels have 2 major differences: the spline hole is 2x as big on a 987 and the 986 wheel has a collar around the edge while the 987 is flat. There is some foreign adapter thingy for a VW that supposedly will work, but with something as important as a steering wheel, why would you want to cobble it up?
Go with the Porsche 986 3 spoke wheel. As an old 986forum contributer once said, it looks like a pair of women's sexy underwear.
http://986forum.com/forums/general-discussions/29130-steering-wheel-fitment-question-997-986-a.html