When i contacted gene berg direct heres what they said...
Hi
The GB 6750-LK with black T will come to $531.78. From your email address I am guessing you are in the UK. Shipping will come to $94.30. Is your bus LHD or RHD?
i got mine from the factory too it was an English guy cant remember his name, maybe andrew, sent me a few teeshirts too! top bloke. i did buy 10 though!