Rock Auto had a 4 row brass and copper radiator on closeout last summer. Let me see if I can find the link.
I bought one for around $130.00 but it sat a bit high on the core support. One could fab up some upper brackets I am sure to hold it down.
Holy Crap! I found it. Give them a call, it may work for you.
http://www.rockauto.com/en/parts/vis...,radiator,2172