Saying Hello and rear carburettor problems.

Hello,

Just bought a 1991 VX 800. It only has 12000 miles on the clock.
Unfortunately someone had a go at replacing parts for the rear carburettor. Used a bloody hammer and gave up. Dented the float chamber. 

So, although it's running I will need a new rear carburettor. Looked on eBay and a few other sites and there aren't many about. There is on in Germany for £140. Seems a bit expensive to me . Any one any ideas. I'll look around this site and get some info.
I am based in a small town on the Yorkshire/ Lancashire border called Barnoldswick. It's about 9 miles from Skipton.