Ian,
I'm not sure what you are after. There are adapters for the Getrag/Audi box to 302/351 series Ford motors. You can use clutches other than the Audi clutch. RF uses something that is pretty beefy. There are about 3 or 4 different GT40s on the market setup to take this transaxle - the RF, GTDs can, American GT will, and the CAV car. So, getting the adapter should not be too difficult.
Even if the bolt patterns are not the same it'd still be a damn good place to start work as not much in the way of mods would be required. Maybe some pictures of the Audi 5 speed will help, I'll try to get some up.
Here are some photos of the 3U box I brought in from Germany, quite dirty. My 5N is almost pristine, this one will take some work.
Sorry about the terrible pictures but my wife has the good digital camera, I have the mini 1"x1"x3" pocket model with no flash.
Ron
[ July 04, 2002: Message edited by: R. Earp ]
[ July 04, 2002: Message edited by: R. Earp ]
[ July 04, 2002: Message edited by: R. Earp ]
[ July 04, 2002: Message edited by: R. Earp ]