Tunnel need to have the gear lever hole moving back about 1 1/2" to 2". It is possible to get some adapter blocks that allow the gearbox mount to be moved back, but there is not much room in the tunnel and the box normaly hits the side where the gearbox mount is welded to the tunnel.

I did mine by undrilling the mounts and moving them back then rewelding in the right place for the 5 speed. Also the tunnel needed to be widened a bit where the box will touch the tunnel. scissor jack sorted that.