[Roadsters] Radiator Identifications...

[Eddie]

Ok,

So i'm going through my parts supply, and it turns out I have 4 
radiators.  Two of which I know are good, two which need to be re-cored.

I've noticed that there are slight differences between them, and want to 
identify what years they came off of.

The difference specifically is this:

The vertical distance between the holes that hold the fan shroud on 
varies.  On two radiators it's 6 1/4".  On my other two, it's 7".

Does anyone know which years had which?  Thanks...

Eddie