1957 should be perfect for what you want. No additional crossbar required.
I just thought I'd point out a mistake in the instructions for the 1957 kit. The drill guides are mis-printed. It has three 1-3/16" templates and one 1-9/16" template, when it should be the other way around. But actually the templates are no good anyway, because by photocopying the instructions for inclusion in the kit, the templates have shrunk. So if you drilled those holes, you'd miss completely.
I installed the kit yesterday, marking my own holes based on the text, and it all went very smoothly! (But those rivets are tough to pop!) I had to work on it while the parts were cold, otherwise I couldn't get the old rubber inserts out of the aluminum tubes.
Thanks for providing the upgrade! The tendons (even the newer white ones) always concerned me, since they were always under stress. Plus I could never get the tillers and crossbar apart.