I have 2 stanchions on hand. I purchased 4 for my 1979 37c and only used 2. They are the same height and lifeline holes are the same. Base plate is slightly different. Same welded wire reinforcement at the base, same size plate. The bolt pattern is slightly different
I plugged my old holes with Marine Tex, made a backing plate out of aluminum. (originals only have washers). I also purchased a small piece of Star board and cut new spacers. Since the base of the stanchion fits over a small ledge, this washer/plate fits under the stanchion plate. I removed and re bedded all of mine this spring. I believe have several starboard washer/plates left if you need some.
Let me know if you can use them, I can look for them.
50.00 for both stanchions, spacers and shipping. You can't beat that with a stick!

and you get an Oklahoma guarranty (if it breaks, you get to keep both pieces)
Jose
S/V Bonheur