Roger Hi,
As luck would have it my bruv is an SD1 nut and has several, also organises Rover club and GT40 club Not that that is relevant anyway, have just had a word with him and he has several boxes that may fit bill, he is aware of all the different bearing specs and gearbox types, he is based near Stoke, so not so far away I will BM his mobile as well as my number if you want to contact me first,
please Dont ring him for 24hrs, his partner has just fallen on Ice and is in Hospital should be out tomorrow though,
Cheers
Tim