Rear Carrier

Hi Guys - I'm trying to source (in the UK) a rear carrier to support a top box for my 850 Mk2A Interstate. RGM list such an item but they are out of stock and likely to be so for a long time. Have any of you any ideas ? - if I 'Google' for such an item all I get is lists for modern sportsbikes etc.

Cheers,

Bruce C makes a real fine set up for hard bags too if you like. see them at:
http://tritonmachining.ca/