wire sheath 66 deville conv.

[spolij]

the sheth? is rubber and protects the wires and vacuum lines between the door and the body.

[Jeffrey Burland]

Rubber conduits is what you're looking for. Rubber The Right Way sells Steele Rubber Products' items for a discount. I'm sold out of good used, but here they are new. Since they're correct for a few other GM divisions, you may be able to find them for less through higher volume resellers. Please steer clear of OPG in your search. https://www.rubbertherightway.com/1966-cadillac-restoration-parts-power-37485-prd1.htm
thanks, Jeff