You wont need seatbelts for a pre 65 car.
Dont know about indicators (sorry)
You will need some form of washer jets or some means of getting water to the windscreen (or an opening or no windscreen!) as even if a vehicle never had washers it still needs something for an mot. People use various methods (like a sweezy bottle and some hose etc) , have a search for more info on this. I dont know how they worked when your bug was new though.
Dont know about indicators (sorry)
You will need some form of washer jets or some means of getting water to the windscreen (or an opening or no windscreen!) as even if a vehicle never had washers it still needs something for an mot. People use various methods (like a sweezy bottle and some hose etc) , have a search for more info on this. I dont know how they worked when your bug was new though.