The right radiator
 

I'm trying to buy a radiator from Autozone, and they keep ordering the wrong one. My upper and lower coolant hoses are both on the passenger side, and the cap is toward the drivers side right? Well mine is, do I have the OE radiator in? It's never been replaced as far as I know, and I got hoses and there the same as whats on it. Are they just dorks or what. I cant find anything other than 2 row for some reason, I did see some 4 row on line. Hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm.

Mine is on opposite sides. Inlet is on the drivers and outlet is passenger side. Yours is just cracked out.

You have the early downflow rad that came on the non-IC'd trucks. Then they switched to a better cross-flow design in mid 1991 for the intercooled trucks. I don't know the bolt up differences, but the new crossflow rad with the return on the driver side top is a much better unit.