Thanks for the replies. Finding a reasonably priced stand is proving difficult. Motorworks here in the UK seem to supply the right one but want £125 for it which seems a little steep. Are there any other stands that are known to fit or can be modified? How about the R100GS stand which is available for a much more reasonable price?
As for the seat, yes the one that's fitted is correct for the bike but is in a bad way and I've always liked the other style. Am I right in thinking that some R100s still had the older seat in '81? USA models perhaps? This advert from 1981 suggests so. The second pic is what I have fitted at present. Anyone shed any light on this?