I know the b210 auto tailshaft has the same output spline as a 63a box, so it's just a matter of getting it to the right length. I've also been told once that the E15 clutch plate used the same gearbox input shaft spline as the 63a box & can be used with an A series pressure plate to make it all fit. This would probably be easier to find than a clutch plate for a gearbox that wasn't sold in Portugal, even if it's technically the same part. Might be cheaper,too.