Hi B44&TRF501xRacerEx,
Just found out they also sell the diff screws and nuts together as a whole. You get two nuts and two screws per bag. Tamiya number :
AO-5014.
Take a look at this site for a uk distributor.
http://www.davesrcmodels.co.uk/shop/...26aid%3D115%26
I ordered mine from racingfactory in finland (
www.racingfactory.fi).
Hope this helps....