Bracken tell me they no longer provide a sidestand for the R100 GS - however since I posted this message I have been sent an email which put me in touch with Ernie at Overland Solutions (e-mail:
ernie@overland-solutions.com). He is able to do the work - not sure how much it will cost though and the stand can be built to my specification.
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Fuzzy Duck
(I'm quackers about bikes)