76 Z1 rear wheel, are there other bikes that match it?

Looks to be all there except for mirrors.  Hard to tell but carbs appear to have fuel/air screws.  They may be the original 26 mm carbs from 76.

Nice find for $500.00!  Would make a great refurbed survivor.  Reasonably easy resto platform too.  Great project either way.

hardrockminer observed the mirrors missing.  Looks like turn signals too.

Seat looks like one of the Saddlemen touring seats from the day.  slmjim had one on his '74 Z1-A for ~20 yrs. or so.  We'd have to see the seat pan to be sure.  Maybe not a handsome seat, but comfy like no other; akin to putting on another butt.  At the end of a 250 mile day the comfort is felt while the seat was unseen.  Water soaks into the foam through the stitching from rain or wash, then one's butt gets wet when sitting for a day or three afterward.

Good Ridin'
slmjim & Z1BEBE.

Back in the 70's when everyone was into the chopper scene, I worked at a custom shop where we did those 16 inch rim conversions. Must have done close to a 1,000 or more. We had a guy who would come weekly and pick up all the customers wheels for lacing and trueing. There were three major custom shops in Minneapolis one of them being Drag Specialties which most of us recognize.

We also had a exchange chrome service where you could drop off your covers and we would exchange them for freshly done chrome covers the same day.You could also buy 8-10 inch extended fork tubes and pullback handle bars which we made cables for in shop. Don't forget about the 4 into 1 pipes. A lot of stock parts got tossed into the bin back then.
My ride back then

SF4t7, thanks, thats great news.

DOHC, thanks they are right by one of the greatest motorcycle roads in the world.  Glendora Mountain Road.  Ill check them out.

Wookie, thanks, I'm trying to get to know this site, but many things are hard for me to navigate, ill get better.  Install all, ill remember that.

Asphalt900, Yes, that air box is going to be removed, but Ill keep it.  I regret stripping my 82 Katana 1000 of all things I didn't want and tossing them, this one Ill keep.  And yes, pusing that thing sucked, the tyres were flat, and I didn't know how much pressure the 35 year old tubes would take so I just put about 7psi in them, that was a long push.
 

Like this Zoid. Note the differences of 303-305 but original "albeit" dusty, we live on a gravel road, KZ900/1000 rear hoops/rims. Had to get down to the outbuilding eventually. Have several but not perfect enough for me and i really have not had good results with re-chroming. They fill-in the font of print and lettering becomes "smeared".