John, I got the "generic" coolant overflow tank from the Filling Station a couple of years back. Here's a pic (it's the stainless steel cylinder on the firewall)
Coolant recovery tank It works good but if I were doing it again, I would look for one of the original optional "Radiator Overflow Condensers" that looked a bit like a coffee can and mounted in the same location on the Advance Design series trucks.
