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JCW GarageInterested in John Cooper Works (JCW) parts for your 1st Generation MINI? This is where JCW upgrades and accessories for the Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs are discussed.
Seat heater probably wouldn't be too difficult for someone who has some experience with car upholstery. What I'd be worried about is the airbags. Although, if you don't mind not having them, there may be an aftermarket demand for them.
I was wordering about airbags, The JCW Sport Seats Do not have them?
Correct, the JCW Seats do not have the side airbags found in the OEM seats. That is why the seats are not available from Mini in the US market.
Depending on the year of your Mini you might also have an airbag sensor in the passenger seat. There are multiple threads on seat replacement. Dr Phil G has a thread where he showed how he installed the seat heaters and I think the pressure sensor too.