mad monkey gear / diff - help please

[mxer_kk]

Hi,

i've just built 2 monkeys. One going well. One not going. Traced issue to the diff. I want to buy some replacement parts as per this link
http://www.ebay.co.uk/itm/3104347497...84.m1438.l2649

can't find them anywhere on the www. Can anyone help please?
one car is no fun, you need two.

There are similar parts available under Team C but they all seem to be hopup circa €50.

thanks

Ian