Well the clubmans are pretty easy, just look for 35mm. The gauges, well what is wrong with yours? New gauges are easy to get, it is calibrating them to work correctly that is the problem. The seat, what shape is your pan in? Remove the trim ring and pull the cover off. Lok at your foam and seat pan. Some corrosion is common. I got mine blasted and the holes filled in. Then reused the foam and got some marine grade vinyl and had it recovered. In the FAQ sections, on the second page are numerous sources for parts. Check those out.