I've decided to rebuild the carb heating system and I'm in need of a few items. The PO had left both ends of the tubes unprotected for many years and they were completely blocked with years of gunk.

Does anyone know where I can get replacement nuts and o rings for the tube that runs between the two halves of the intake manifold. 

Thanks

It might be worth a shot sending an email to Z Therapy. 

Thanks, I had the same idea and sent them an email earlier today. Hope they can help.

I think they are BST type thread. I bypassed my intake, removed the back pipe and replaced the 3 way with a 2 and then plugged the thermo housing. Then left the manifold water ports opened. You can buy BST plugs amazon or at royal brass.