You're on target, Doug. I've seen the two hose in the top types, but I prefer the one with the bottom connection. I have one I bought from J.C. Whitney around 1980. I figured it would last about a year and it is still going strong. Sort of a milky white plastic bottle and a holder frame that connects to the back side of the radiator support. If these are set up right, you never have to mess with your coolant until you think you want to change it or something. I've seen some really elaborate ones with cooling fins and such, but I figure if GM, Toyota, Subaru, Honda, etc use the milky white plastic bottles that's fine with me and probably all I need. They sell the same exact one I got on Amazon. Here it is:
https://tinyurl.com/xwcma5we
