Aaron at performance radiator seems pretty knowledgable. 1800-522-2446.
Mine isn't Aluminum, its 18" x 21" x 3" (1966 Mustang radiator) Part# 130 cbr
3 core. It has a SPAL 16" straight blade pusher as the only fan. It fits like a glove, and keeps my 4.3 cool.
I got dressed, and went to the garage to get those measurements for a 4 year old thread?:eeek::wtf::scratchhead: