air cleaner assembly air reclamation hose

[jacobNYC]

On my 72 Bav, there is a hose to reclaim exhaust air from the engine to the carbs, it goes into the bottom of the air cleaner assembly.
I need to replace it, but cannot determine the part number, or for that matter find generic hose of that width. I think its a 20mm hose. The realoem diagram does not show that part ID, just ignores it.
Does anybody know where I can get a suitable replacement hose? It needs to be very heat resistant.

[ROYinGA]

tubing like the newer cars use for insulation cover on power steering and Freon hoses under the hood.

[ROYinGA]

manifold for a US 3.0S Bav. you have to look up under the 3.0S ECE cars. I assume the hose you are looking for goes from the front manifold cover to the air cleaner housing. You can find some other pictures for the fuel supply section of the carb area. I think the hose is in the range of 50/60 mm. I included a picture of the manifold cover connection. The 2002s also used some of these hoses.
http://www.realoem.com/bmw/showparts...61&hg=11&fg=50