WANTED: NOS GM Bulk Heater Hose – 5/8" & 3/4" (1960s GM)

[MartyW]

Looking for authentic NOS GM bulk heater hose in 5/8" and 3/4" sizes for a 1968 Camaro SS‑350 survivor restoration.

Must be original GM-era bulk hose
* Smooth wall (no ribbing)
* No GM logos
* No part numbers
* No white stripes
* Correct 1960s Gates/Dayco GM supplier texture
* Soft, pliable, no cracking or dry rot
* Cut lengths or partial rolls OK
* Identified on UPC 1 M4 of 1968 Camaro AIM

Not interested in
* Reproduction hose
* Corvette ribbed hose
* GM‑logo hose
* Modern service hose
* Anything molded or stamped

Why I need it
Replacing a few non-NOS reproduction parts on my 1968 Camaro SS 350 survivor and documenting original assembly-line appearance. Camaro used plain smooth bulk hose, not the Corvette-style ribbed/GM-logo hose.

Ready to buy
Willing to pay fair market value for genuine NOS.

Please PM with photos, measurements, and any provenance.

Thanks for looking.