I'm glad I found this forum, I wish I knew about it earlier.
A bit of background info.
I have a 1982 Honda Accord 5 Speed with 24,864 Miles! Original owner since new!
This car was bought new by my father in 1982 and shipped to Europe (Greece) where it has lived since.
It's used when traveling oversees almost every year. It's been garage kept since new and basically looks and drives like new.
I did some preventative maintenance this summer (Filters, Plugs, coolant flush) and it ran perfect. My father is still there now and he said one of the radiator hose blew.
I plan to go there in about 2 weeks and purchased upper and lower radiator hoses, and was looking to get the small hoses that go from the thermostat housing and another similar diameter hose, I assume going to the heater core? Problem is I can't find the hoses anywhere. I wanted to get bulk hose and cut it to fit but I don't know the inner diameter of these hoses (3rd picture with orange outlines).
Any help you can provide is appreciated. Thanks.