My 1971 2a (which was the last year of the 2A) still had/has some BSF stuff on it including the wheel studs and huge nuts which is a real pain. I used to be in the aircraft biz and the old British aircraft where only Whitworth, (BSW) BSF and BA I still have some common sized taps and thread charts in what used to be the Yellow and black "Zeus" bible. I don't remember what the door hinge clip nuts were as I just changed them out for 5/16 UNC ones. I did look at the link and was impressed but not by the prices.