Hi Andy,
When I bought mine, SPC had 2 huggers in stock I believe one was an 1150 GS Item the other an 1100S (if my memory serves me correctly). I was worried about width (ooer) as I run a 180 section tyre on ally rim. Anyway they let me try them both and there was very little difference. I think I'm right in saying the "wrong" one fouled the brake line clamp on the swinging arm or some such thing. However even side by side you would be hard pushed to spot the difference.
Hope this helps,
Duncan.