Is your gearbox a 4 or a 5 speed that's fitted to the car? This measurement seems to be a very grey area as most installations are all that little bit different. In most cases the gearbox mount will need to be spaced away from the body.
90 mm approx from the centre of the propshaft sliding joint to the the top of the tunnel is the measurement I make on my car that's fitted with a type 9 and a bespoke gearbox mounting. I hope that's of some help.
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