65 rocker cover support spacing

[DaveU]

Could anyone tell me the proper spacing dimensions for replacing the rocker cover support/reinforcements. I have had to replace the original rockers and purchased replacement of the reinforcements but have found no dimensions in any of the manuals or books that I have. If someone could measure the placement on their car and use a body mount as a reference that would probably be sufficient as I understand that the location was not that exact when the body was assembled at the factory. Would be grateful for any help or suggestions

Thanks