[Alan Roehrich]

Northern Radiator has a fairly large selection of aluminum radiators, and they can be bought with fan shrouds, electric fans, relays, and complete kits with all of the above in one tidy package. I've used their stuff before, and it is quality stuff.

Be aware that for aluminum radiators, at least most of the performance versions, the tubes are 50%-100% larger than those in copper brass radiators. So a two row aluminum radiator may have two rows of 1" or 1-1/2" tubes, where a relatively equivalent four row copper/brass radiator would have four rows of 3/4" tubes. The aluminum radiator will cool more efficiently.