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Iare you talking about the little rack for strapping your pack to?
The only "bum bag holder" I've ever seen fitted to the LS was the Krauser type frames - they had options for varying the height and the "setback' of the carrier.You can still buy the parts (at a price) from Michael Krauser, but you will have to nail a set of Krauser frames first. The good news is that I havce a set of Krauser frames that are going to go on my R65 and a long time ago I bought the R65 specific mounting brackets just before they went NLA forever.If you score a set of Krauser frames I will lay out the mounting brackets on sheets of graph paper and take lots of photos for you so that you have the measurements.If I can find a picture of mine quickly I'll attach it.
It's hard to tell from the pic but will the seat clear that if the seat was open (does the seat open separately from the cowling on the LS?)