Under the rear cover there are mountings for the bolts. Possibly a option for the K5 650. I know many just remove the backrest and install a box. Thought someone would have a set. Having said that the oem bolts are fairly cheep.
Yes the frame has the nuts already welded to it. In 05 they did offer a luggage rack and a top case as options. Both bolted into those nuts. If you look on the bottom of the cover it is marked where to drill the holes for the bolts to go through. I had an 05 before I got my current 07 and I mounted a GIVI topcase on it. The mount for the GIVI came with bolts. They are longer than the ones that hold the OEM Executive backrest on. If you are mounting something other than the OEM style backrest you may need longer bolts.
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