Peter
GT40 Australia built Duane Hart's DRB GT40 a couple of years ago.
We fitted Simmons FR16 x 8" wide and x 10" Front and Rear respectively. Offsets are as per the Build Manual. The tyres are also as per the Build Manual (Front 225-50VR16 and Rear 255-50VR16)
The standard DRB GT40 rear bodywork matches the earlier Mk 1 Race Cars and allows 10" wide wheels and at least 295-50 section tyres, while the super wide bodywork option, as used on the 1969 LeMans winning Ford GT40 allows 12" wide (up to 18" diameter) wheels and at least 335-35 section tyres.
The super wide bodywork is very popular and 5 out of the last 7 DRB GT40's built had that option.
Peter Ransom