Model A sub-rail questions

Can anyone tell me what the basic differences between subrails are between various body styles?

For example, I need full sub-rails for my roadster. I have a very nice set of subrails from what was probably a sedan, from the firewall/cowl to about where the B-pillar would be.

Are those the same as the roadster from the cowl to about that spot?

Can I just get away with buying the rear portion of the subrails instead of the full set?

Are the roadster subrails somehow unique roadster only pieces?

Thanks ahead of time!

 

roadsters are different
look at american muscles web site
they are a dealer for brookville
tk

 

I was afraid that was the case. Thanks!

 

Simpiler just to purchase the correct items.
You could always sell the others to help fund the correct ones.