Gear diff in the uK

[Crazy L]

Good evening Gentlemen

I'm running a TC02T (that's a truck btw), old skool rear motor concern. Alas, having a run of bad form with the ball diff and noticed that there is a gear diff conversion for it, but can't seem to find one in the UK. I have checked out my usual suspects, aka modelsport and Inside Line, but t no avail.

I priced it up on TC models in hk, and it came to $80+, bit steep really. Would like to buy from UK if price is similar.

Any help would be gladly appreciated. Thanks.