The battery is an Optima 12volt in a 6 volt case. From antique battery
www.antiqueautobattery.com/The alternator is 12 volt neg ground three wire. I converted the car from 6 volt positive ground; new lights new wiring, resistors in instrument panel etc. I had
http://www.turnswitch.com/ redo the radio to an AM/FM using the original face plate and installing it in the old case. I also installed a modern retractable antenna.
The headlamps were on e-bay as ones to fit a 55 Chevy however most can be found in electrical parts catalogs look for sealed beam halogen.
Package tray was bare metal from factory, I chose to just complete the dash and rear seat theme by doing the package shelf the same.
Dealer installed options included outside rear view mirrors, window washers, spot light, trailer hitch, and back-up lights. Several options for the windshield washer, the one I chose uses the 12 volt pump with the bag off of my parts car, other options were with a manual foot pump and a manual hand pump.
As for the outside mirrors I chose ones for an Austin Healy sports car. If I would do it again I'd try to get larger mirrors closer to the driver. I chose these due to the through door spotlight a KF option which was on the car when I started the job.
Spin off oil filter was from a Ford truck catalog and matches the bracket for the FRAM canister. I also installed an electronic breaker switch in the distributor. Hope this answers some of your questions if not just ask again. John