32 vs 33-34 Pedal Differences???

[hotrodA]

I have three sets of pedals that I need help in determining their origins.

They are the same dimensions and shape, however two sets have I-beam cross section clutch arms, while one has the oval cross section like its brake pedal mate. The brake pedals are all three identical.

This is one set with the I-beam clutch arm

Any suggestions from you experts? Hours of searching on here came up with zip.

Thanks!