Marlin is thinking about doing one, but nothing yet. I was talking to Alvaro about it in Moab.. I'm sure it will cost > $800 though. Slee also sells one I believe, from Mark's Adapters? but it requires a 2" body lift.. it's on the Shortbus though and works well asaik.
99 uzj100, gx470
05 525EXC, 01 XT225, 07 TTR90, 07 CRF50