I'm piecing my '85, 600 together and need to pick a fan to mount on the T2 radiator that's going in it. As you can see from the picture, I have two. I assume (maybe wrongly) that the aluminum fan version is original to the car (but then why is there a junkyard scrawl on it?). The T2 radiator/intercooler I'm using came out of a junkyard '87 LeBaron but I don't think it was original to that car. The plastic blade fan may have come from that.

I'm leaning toward the plastic fan version as it might be quieter. Both fan motors seem to have good bearings. The car has A/C if that's a factor

Thoughts?