71 Duster 340 Inviolet V-24 How Rare??

Couple more questions. Would the fender top signal indicators have been coded on the fender tag? It has them now but not sure if they were original to the car. Thinking they may have been since it has dual chrome rally mirrors.

If I can't get my hands on the original 4 speed what would be the best option for value to the car, a keisler 5 spd or just use the non number match 833 4 spd?. Opinions???