Thank you David.
I do have the master cylinders. But good to know about the Matco.
I found the slave cylinders from my old totaled RV-3. Yeah!
One of the Cleveland discs appear serviceable.
My wheels are Cleveland 40-78B. Looks like the disc for those are the 164-1700.
I was able to find the Cleveland to Rapco cross reference.
If I can borrow my neighbor's lathe I might be able to turn down the pitted disc and still be above the 4.242mm minimum thickness.
Otherwise the Rapco RA164-1700 at $89 plus shipping from ACS East sounds reasonable.
When I bought my RV-3 project back in 1996, the seller mentioned that it included Cleveland wheels and brakes. I thought "So what?". Now I know why he mentioned that.
Astonishing that one Cleveland 40-78A 5.00-5 wheel assembly now is $1,600. That's $3,200 for just the wheels and no brakes, tubes and tires! I may have a used pair for sale