Those frames have a golden tint to them. Too bad, huh?

"No corrosion" would be something to consider as a replacement. Especially if they go cheap. Also the ALL the screws still work. That's something!

Just measured 338's aluminum ones using an american tape. 23 3/4" long and 10 7/8" width. That's larger than what the seller states.

Even a 1/4" difference in either dimension could make it impossible to refit a slight smaller frame onto an Ariel - if that is what the 37 has.
Assuming that all Ariel's had the exact same size frames over the years.