"As a starting point, I'd suggest Uniradio 67 (RG-213), but be warned that the dimensions have changed over the years and it's no longer 0.45" o.d. but 0.405" and you may need to sleeve it with tape."
"RG-11 coax have the same dimensions as the original ones."
One source I looked at also gave RG-11 as having an OD of .405". Would heat shrink tube be a better material for packing the smaller wires out to the 0.45" dimension? I would think the adhesive lined version (maybe the unlined version too) should stay in place better than tape if the cable is moved about.
According to answers.com - RG-11/U is 75ohm and is usually triple/quad shielded and typically has a maximum attenuation of 3.65. RG-213/U is common form amateur radio and is 50 ohms and is single shielded with about a 5.95 attenuation.
I don't know anywhere near enough about the subject to be able tell what this might do if you are looking for a functional as opposed to cosmetic substitute.
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