I got a coolant recovery kit from Advance Auto parts. It was their smallest sort of hex shaped bottle. The low/cold and full/hot markings on it are perfect for my 22 inch radiator.
Yes they aren't the greatest things to look at but they work very well. I have at least 4 of them on different vehicles and haven't had any fail. One is in my chopped 66 Chevy 1/2 ton w/440 and it's been there since 2000. They just work.
