Ian, my design was for 103 - 105 , and these are still being used by several original GT40 race cars for testing etc, particularly at Goodwood. The other criteria was to get this performance with very little ( no ) performance loss, these are straight through but with some ingenious internals...
Douglas, there is no one answer ! it depends on the actual suspension / hubs etc you are using , there are many different options that can be used, and SGT and AK have used several . Get it right before you buy your wheels, can be a very expensive mistake to get it wrong !
Have not read the whole thing, but looks like the critical thing is the distance from the flywheel face to the thrust bearing face will be the critical decider on our cars . Frank Catt