High tensile 2x25mm cap screws and nyloc nuts for Tamiya DB-01 diff and others models?
I got these from Model Fixings. They are a direct replacement for part no. 9949350
In fact there are more here, enough for several cars.
£5 posted 1st class or through eBay if you prefer...
http://www.ebay.co.uk/sch/kaszal/m.h...id=p4340.l2562