Keystock was a quick and easy way to do machine setups when you needed parallels.
Tolerance on them were +/- .0005 in those days.

My suggestion is if you order some stock in?
Mic each one, every 1", both sides and use a sharpie to label each one.

To me, +/- .003, is just not acceptable.

Don


1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!