Hilltoppers, gotta love them!
I have done considerable work to both mine while keeping them dependable, safe to ride on the street and keeping the original look.
If you need your seat done correctly manchester1 is the resident go-to member and very likely one of the worlds best who reproduce mini bike seats. I'm not exaggerating, not even a little.
Both mine are original ...
If your tires are weather checked "Hi-Run" makes a reasonable replacement.
The foot pegs on the swing arm will beat the hell out of you on the trails! There should be foot pegs below the jack shaft.
I agree with Tom S, its original only once ... the beauty and value are in that.
In this last pic you can see lights with turn signals were added, switches on the left handlebars control power on/off, horn and turn signals.
Battery boxes were made and mounted in front of the motors. Rubber is between all the box mounting surfaces as to not schmuck up the paint.
Bicycle safety flag holders were made and mounted under the seats.