Thanks everyone for the suggestions, i spent hours looking and going on chineese and jap sites using google to translate the pages. Non of which ship to the UK. FMV-3GMR is still available but hard to get to the UK.
I bit the bullet and contacted Craig at giz10p. He has 2 new tri sync chassis that have been in a customer ordered cab and used for 30mins then removed. These are 95+VAT. I ordered one and its on its way to me now.
So i have a sanwa chassis available for spares or repairs if anyone interested.
Thanks,
Chris