We carry these lock down bars with the correct corners. These are out of stock currently - but this is what you are after ?
https://www.rtbb.com.au/product/lockdown-bar-standard-for-bally-williams-1990-1998/

I don't know? lol.

The one I have is slightly longer than the original ones. Hence why I don't like it. Trying to find the original which seems to fit a little snugger.