Hi Shawn,
You can get some clamp on air filters from a company called Sudco. They deal in carburetors for all types of motorcycles,new and old. Also K&N filters makes clamp ons for motorcycles. You can check the both out on the web. You may be able to find the stock air cleaner housings at a motorcycle salvage yard. The brass fittings on the bottom of the float bowls are the carb overflow drains and they originally had a hose running from them to the back of engine. The fitting on the top of the engine is the crank case breather and it normally had a hose on it that ran down in back of the engine below the swing arm and was just left open on the end.
Happy trails
Tom
