I've done several of my own external oil cooler set ups and this time around having trouble finding a cheap Setrab, but found 2 coolers that might fit the bill having trouble deciding. The Hayden has the same surface area of 2 combined 30 row coolers, previously I used 2-19 row both of these look to be comparable to 2 Setrabs. The Hayden is cool because its one instead of 2 units, but its a weird design, has same surface area and BTU ratings but the tubes are less and larger, don't know if this will help or hinder. I'm including attachments to both, maybe someone has some experience with either or can shed some light on it.

http://www.ebay.com/itm/201515646979?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
http://www.ebay.com/itm/160578859562?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT