From the manufacturer:
We originally designed these seats for the early 1960s Mini Coopers, however they will fit all other Minis too! Apart from their stunning design, these seats come complete with our very own subframe, which is designed to be the most stable unit ever offered for Mini bucket seats. The frame actually sits on the original plastic strips on the carpet to the correct width designed by Rover Cars. There is an anti tipping mechanism for safety and easy access to the rear seat. You need only two 7/16 AF spanners to undo the nuts and bolts holding the seat in place.The range of colours will match original 1960/70s Mini Coopers or there is a range of plain colours to suit other models.
Special order, may be subject to a $25 handling charge; lead time required. Actual colors may vary from those shown due to monitor display differences.