Parts availabilty isn't as bad as people make out, you just have to not be lazy and put some effort into looking.
Fenders - fibre-glass repro fenders are readily available for the 800 & 1500.
OEM bag mounting brackets are still avilable from some factors and I've often seen used and new ones ebay.
OEM Indicators can still be found at some suppliers - and are still available from Japan (I got a pair of chrome rears just before Xmas).
Speedo drive cables - still available if you look hard enough, or you can get one essentially the same - the ends are generic.
Carbs can be a problem (mostly because people don't RTFM and break them). But repro carbs, complete with the TPS, are available on Amazon (I have no idea of the quality or if they come correctly jetted).
An after-market rear shock of excellent quality is available for the 800.
If you see a NOS part at a bargin price, grab it. (I found an NIB rear fender and a right hand switch cluster for my E2 for real bargain prices).

