74 Duster, resto mod 6.4 conversion in Australia

I don't like the tubular the end on the firm feel is butt welded onto the large bar looks like it would need a lot to tear off.
Just called my mate Bill he has 13 cars & couple of Barracuda's he said he has a big box of old arms said a & B body are all the same.
I know my 72 B body & E body are the same bar don't know about the A body.