Have alot here:
http://www.micra.org.uk/f11-buy-and-sell.html
alot of threads about people breaking their cars.
If you cant find any: Look on ebay, plenty of breaking cars on their! Just email the seller.
You might want to grease the heater motor bolt thing, as that can cause the resistor card to blow, I got a small packet for about 80p from afl, after 2 cards stopping working after a day.
Better safe than sorry.