Here is an Ebay auction for a used 65/66 choke cable by Ebay member "magmustangs" with a starting bid of $299.00:
1964 1/2-1966 Ford Mustang, Fastback, Coupe, Convertible, GT, Shelby GT350. 289 High-Performance CHOKE CABLE With DASH MOUNTING BRACKET. Does Not Have a Knob. This is an ORIGINAL FORD PART. Removed from a 66 Mustang Fastback with Factory 289 Hipo Engine.. This cable measures a hair over 57 1/2" overall length. The Cable is in Great Original Condition. No Rust. The rubber cable covering is deteriorating and cracking. The Cable is Great. Moves in and Out Well. Has a great mounting bracket. Overall, this is a Great Original 289 Hipo Choke Cable. IMPOSSIBLE TO FIND ORIGINAL.