Hi Roy, I'm sure that you know this already, but the originals didn't use the 5DS25/2 box, they used the 5DS25, which have only 4 bolt mounts to the bellhousing. The original gearbox is similar to the later 25/2 type, but is slightly shorter.
The 7 bolt bellhousings were mainly used for Panteras, but with the box in an inverted configuration.
It might be worth trying Mathwall Engineering, I know that he sporadically has bellhousings made up, but they may only be for the 4 bolt originals.
I have an original 5DS25 box and bellhousing from an original GT40 and also a copy of an early bellhousing. If you would like to have a look you are very welcome, I live in Surrey.
Regards, Mike (aka Jasper)
The lower mounts on the bellhousing of the originals had a tendency to fracture and were deleted on later cars.
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