yup, i had the same problems with the front seats. in the end i made squarish shaped mounts that went between the old mounts and the new seat bases too. i ended up removing all the plastic moulding and aluminium bracketing on the drivers seatbase to get adequate access to the handbrake. again, i then just covered the ugliness with carpeting.. looks ok, but i'm sure you'll do a nicer job, which i can then copy
