Your likely best choice might be a 32 seat frame.
The A was a narrow body and they later cars were much wider. The slants are tough as they needed a relief in the middle for the rachet seat adjuster.
You either need to try places like Berts for originals, which I would guess any they get that are useable are spoken for already. Or just buy a repro set.
This advice from someone who has a slant window cabriolet who's springs likely tougher to find. It took a few years and I was able to locate some good originals, by accident.
