For the plastic gear bit these are available in USA for numerous Tremec boxes and not expensive. I've bought a few for my Tremec box, and I think IIRC there are numerous product no's for different types of boxes. Mine looks identical to a T5 one save the little nose bit is a bit longer, but nothing a sharp knife or hacksaw wouldn't fix.
They're peanuts in the states. Colour coded according to the no. of teeth if you're messing around with wheel size etc.