I've been asked by a few different people about obtaining the buckles and strap retainers for boots. In compliance with the RPF's rules I've become a premium member in order to sell these in an official capacity. I should be past the 45 day period on the 1st of next month at which time I'll have organised the parts for sale. I'll let you all know how to get them, and I'll make sure it doesn't cost much.
EDIT: While placing an order for a customer I found some leftover brand new buckles which I had thought we were sold out on. Below are the links for all the parts we make that were used in the film. If we do run out of stock on the new ones, I still have my used ones I'll be able to supply. As I've said once before, I just work here. I don't see a dime from these sales. Hopefully that keeps me in compliance with the rules.
Rothmore, thanks for trying to help us out with these bits but as another member pointed out previously, retailers are sending out the incorrect parts.
I.e. via the links you provided...
Ordered these: Narrow Off Road Boot Buckle (Silver)
And received these: Crossfire 2/ST Buckles - Crossfire Spare Parts
Ordered these: Off Road Boot Strap Retainer - Crossfire Spare Parts
And received these: Crossfire 2 Strap Retainer - Crossfire Spare Parts