You can fit the seats froma series two car, which are lower. The steering column is the same on all cars, but the bracket which hold it is slightly different. You cant raise the column withouth cutting the dash on a series one car (Lux is a trim level not a model designation). If you are struggling with this then Id suggest late seats and a smaller offset steering wheel. I have two Momo 'Race' wheels (now called Tuner, I believe). One is a D32 and the other a D35. The 350mm wheels mounting is central but the 320mm wheels mounting is offset by around 1" which give a good deal more legroom. The original wheel is offset too, although it is quite large, so an aftermarket wheel may well be decreasing your legroom!