Static tyre balancer for rear wheel

I'm looking for a way to balance the rear wheel on my 1200 GSA. The only thing I can find on the web is a Marc Parnes insert from the USA. Looks a great bit of kit but having just recently been stung for customs duty on bits from the US I'm looking for something closer to home.

Any reccomendations please???

Abba stands do a brilliant tyre balancer and you can buy the gs adapter from eBay fairly cheap. That's what I use and it's pretty good. Just make sure you have plenty of weights as you'll need em.