I retrofitted a 6.1D transmission onto my B6. Had to drill 4x new holes. The two for the transmission didn't go very well but it works. I also found that the B6 slipper self-locates once tightened. Don't forget the .5mm washers between the motor plate and the transmission housing if you don't use the spur-gear guard and DO NOT forget to use the suggested 10mm (9mm would be even better) screws to mount the transmission. Anything longer will distort the transmission case and lock up the idler gear. I believe this is a root cause of binding on the stock car. 10mm might still be a hair too long