Battery carrier and air filter assembly are rare these days, a temporary construction for now will do until one turns up. Bike will run without a battery if the magneto is being retained for ignition.
Longstroke type carrier fits the frame but rubber connection to the carb is different, as is the position, size and shape of the hole, all explained by Jens. I notice the bike has a later front mudguard and the later wide fin barrel and cylinder head, so worth checking frame and engine numbers for actual model year. You may find inside the motor is more good news as regards later parts.
Footrests are a plain taper fitting, left side mounting is a left hand thread, so needs correct stud into the frame, along with the correct L/H thread retaining nut. Lucky fella, you have it.
With siamese exhaust pipe it could have been a sidecar bike, with a lower top speed. Count the teeth on the rear sprocket. 49 for sidecar, but 42 teeth used on solo bikes.
Swarfy
