I was at the shop last week and the guy working on it said, the container tank attached to the rad is starting to leak. Not bad but will need to be seen to at some point.

I have not noticed any puddling underneath the rig. in the driveway or the coolant level in the overflow reservoir going down.

what brand is recommended here? any of the aftermarket ones OK to use?

 

I just put a Nissans in my P38. They seem to get good reviews. Rock Auto had them. You don’t want to wait too long if there’s a coolant leak.

 

ditto on the Nissens radiator. Don't forget to change the temperature sensor as well.

 

I have had good luck with my all aluminum ebay "racing" radiator. Except that it needed modification to fit. So I wouldn't go that route for a direct fit.