cruiserparts in the US say they have part of the system
http://shop.cruiserparts.net/index.php?main_page=product_info&cPath=6_43&products_id=297
But I will warn you from personal experience - I had to convert a number of spare tire under TLC's to spare tire on the back versions. So that the customer can carry 2 spare tires at a time.
1. You will need a different lower section of the tail gate. (with male part of the latch)
2. You will have cut the OEM section of the body - be very careful to expose the nuts for the bracket. Dont cut to deep - only to remove the .8mm steel
3. You will have the cut the upper section of the body. You will then need to fabricate a bracket to hold 3 nuts.
4. You will now need to cut the OEM rear bumper for the lower section of the tire carrier to go though.
But if this is something you really want - I can give you the parts contact we use and you can order - but this stuff weighs alot. Would be cheaper to buy the ARB rear bumper with swing out tire carrier