Kz1000 and Kz650 parts nightmare

I paid for and received from PitStop performance a cylinder head (kz1000). It is ported.
The valve guides fell out and bent several valves plus breaking one.
I put a set of Mikuni RS34 on my 1000 and they fit.
Ordered keihin cr carburetors for 2 years and could not get them.

I order Murray Carbs out of North Carolina (kz650) and that end up being a disaster. Everything hit something. 

Finally got the CR carbs after 3 years off Amazon of all places. Guess what. I have to modify the fuel petcock. 
i now have:

the last kz650 nos cylinder head.

the last black kz1000 head from the historical parts department of Kawasaki .

4 complete sets of new carbs.
​8 cams sets
3 sets of wheels

I had a fire on the 650 from the wiring harness, so i got what was advertised as "nos". It caught fire.
I just went ahead and get a complete system from z1 parts for  a 1977 1000 for my 77 650.

Now I can not find even the parts for the rear brake master cylinder for my kz650.

This is frustrating.