David
It isn't possible to give you an opinion on the centre stand, you simply do not show enough of it - that said, a R100GS stand might physically bolt up but you would notice the effort to lift the much lower R54 the extra 3 or 4 inches to get it on the stand.
As regards the hardware, new bushes bolts and washers would seem to be required. They need to be properly tightened so that the stand "rotates" on the bushes and not in the frame bolt holes, grease is required on the bushes.