i'd buy them and even if you don't use them straight away they're there for another day.
also if you've got a full set ( especially for a 750 ) they won't be hard to sell later.
I've spent the last few years trying to collect a full set for when i build my chopper, the only one i haven't found is the starter motor cover ( which won't be there anyway, it'll be kick only )
also because i've collected a few of the same pieces in my efforts to get a whole set, i'm de-finning some of them to use on the 750 thats getting built as a 'factory' trailbike. the idea is , as i've mentioned elsewhere, to de-antique the 750 by having plain unmarked alloy case covers. many people will i'm sure hate it and what i'm trying to do but i learnt many years ago to take no notice of other peoples opinions. to take it to an even more annoying level, i'll be de-finning the rocker cover too