Basically, the Volare Premier was the Plymouth equivalnet of Dodge's Special Edition package.

Other options/features:

Rear armrests w/ashtrays
Cigarette lighter
Dual horns
Glove box lock
P/S
Undercoating w/hood silencer pad
60/40 split bench seat (standard rather than the buckets)
Luxury door trim panels
Day/night mirror
Electric clock

Granted, that is for a '77 Aspen SE, but I suspect the Volare Premier equipment is the same or very similar.