These guys have black silicone hose. I have not bought heater hose from them, but I have bought several dozen of the 30° bend 2" hose which is used on Internationals with a Cummins. The quality on their 2" is good. I have some that has been in daily use for 5 years. I would assume their heater hose is fine too.

http://www.siliconeintakes.com/elec...inforced-silicone-heater-hose-p-640.html

If you insist on the old timy looking black, I think Dayco still makes it.