I've a left sided VP double sided, buttery smooth axle, tension adjuster. This was probably used very little going by lack of marks and insertion threads, not sure on history as it came in a box of bits I bought a decade ago and more.
End cap is missing and two of the small screws but it seems solid enough. I know I've used VP cleats with 737s and 525s but don't know if it'll work the other way around.
Cost of postage if any use to you.