I finally got around to measuring a factory coolant bottle with that fitting... its a 2" diameter with a 10 pitch outside thread. Im going to go back through Gregs link but I don't think I've seen anything fitting that. I should search on a diesel forum since they seem to like their billet degas tanks... but most of them I've seen have switched over to a standard rad cap.
I just called Moroso because they had a Mustang coolant tank with the bung. They sold me 2 for $10 each. I'll have them in a couple days.
Last edited by Revved; 03-10-2015 at 01:12 PM.
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