I acquired a batch of silicone CIS air box-to-intake pipe hose (item 8 below). Fits 74-77, 80-83 911, 6 cyl.

Specs:
3-ply
Black
ID" 38mm (1.5")
Length: 45mm (1.75")
Wall thickness: Approx. 5mm (0.19")

The factory versions are rubber (911-110-885). These are longer-lasting silicone and more heat resistant.

$18 for a set of 6 plus shipping and PayPal fees.
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To confirm, measure the OD of one of the airbox tubes. Should be about 38mm.

If interested, total cost is $26.00 ($18 + $8) shipped via USPS Priority mail to domestic U.S. locations. Otherwise, PM for other locations.

Sherwood