Aluminum Radiator Options for a 74?

[Lotus]

I spent a good chunk of the day searching for information on the 74 Fiat and it sounds like some have the 73 radiator and some have the 75 radiator and from what I can tell the 73 radiator the fill hole is opposite of the inlet hose side and comes off the side of the tank vs the 75 where the fill hole is on top and on the inlet hose side.

My car appears to have the 68-73 version.

I can find the 75-78 radiator all day long in aluminum but not the 68-73 one. Does anybody know of a place that sells the 68-73 radiator in aluminum?

How hard is it to put a 75-78 aluminum radiator in the 74?

[So Cal Mark]

you would need to remove the lower radiator saddle and lower it for the radiator to fit