I bought a 3 row, all brass, radiator with a guarantee from Autozone. It sprung a leak at the lower hose connection in about 1 year. They exchanged it for another without hassle. That's been running ok for about six years. I think I paid about $120.

It looks like the the technology has changed. Now it seems that single row radiators are normal, but the tubes are twice as wide (front to back). So a single core radiator can have a two inch thick core. -- Matt

'89 4runner SR5, 3.0, auto (fun)
'93 xtra cab, dlx,3.0, 5spd (work truck)