65-6 Monte Carlo Bars

[TJinSA]

Simple right?... well, are they? Had a straight one I may have purchased from NPD for just the end plates, but they don't near cover the contact patch of the one my car has had for years, and the break from one plane to the other is too sharp. So questions start being generated:
1) what is the thickness of an original's flange? Weight?
2) Is there any un-distinguishable from originals out there? From whom?
3) What would/should I look for in a quality piece?

[Background info: My car spent years on the dragstrip so I cannot be confident any part of mine is original to the car]