There isn't an adapter made for the SHO. The only one there is, is the one that Kurt Edelbach had made up. You had to send him your wheel and he would have the hub of it made into an adapter. He's in Germany now though, so I don't know if he's still doing that. FWIW, I drove his 89 with a 4 spoke MOMO wheel in it. It felt really nice. There might be someone on here that has purchased a mount from Kurt.