I agree with Mike. On the American transmissions where the shifter bolts to the transmission, there are bosses cast into the housing to bolt the shifter to and the shift arms are on the outside. I am not familiar with your trans, but most European trans I have seen have the shifter integral to the transmission, that is the shift arms are actually inside and the shifter attaches through the case. You should be able to build or modify a shift lever that puts the shift knob in the right position. Good luck and I would like to see your pictures.

Pat