2020 auction link - https://www.mecum.com/lots/LV0120-392091/1969-honda-cb750k0-sandcast/
No sold price, probably did not meet reserve.

Marty, the shocks are K1 and the seller is a #@*$!.

kp,
The guy asking questions is "Joe" unless his name is Marty.
Is pound, at sign, star, dollar, explanation a good or bad seller ?
The way you wrote I am guessing bad, please explain what you mean.

An original double cut fender is going to cost BIG $$$ and the ones sold from Vietnam are no that good.

True

Most of the other stuff is common through K0, K1 and some on K2 so don't sweat it, but yes keep it as original as you can.

Joe,
Are you keeping the bike original or restoring ?
There is a big difference.

There are used fenders on ebay, mostly newer, a guy in vietnam sells new sandcast (cut) fenders
Used shocks are usually in poor share (yours are after market).
I bought a used stem nut, same price as new - https://www.ebay.com/itm/323878769435?hash=item4b68add31b:g:VbUAAOSwxOBdSvuS
Tree bolts - https://www.yamiya750.com/index.php?main_page=product_info&cPath=246_251_144_72&products_id=191
Frame bolt set - https://www.yamiya750.com/index.php?main_page=product_info&cPath=246_251_185_114&products_id=129

I have an original paint 70, I bought used parts on ebay, the cost is about the same as new parts.
Think about if you want a restoration or an original paint bike.

Diecast fender ?
Front or rear ?

Engine is CB750E-1007844

Agreed A lot of money

I bought a sandcast bike two years ago for $5000.
It needed some work after sitting for forty years.
The guy had two of them and asked if I wanted both, I should have bought both of them but it seemed excessive at the time.

He is asking $7000 for the frame, Kitchener Ontario