I have a 1977 with a replacement 2F engine. When I purchased the truck 2 years ago, it had a knock off Webar carb and no air filter. Bought the small rectangular filter kit for the Weber carbs. It works, but the filter gets pretty dirty, pretty quickly. Found a Toyota 2F air filter assembly, which I purchased on Ebay, used. Cleaned it up and painted. Bought a Weber to Toyota air filter adapter. Adapter just came in on Friday. Brought everything to the truck on Saturday. Sitting the air filter housing on top of the engine, the bolt holes don't line up and the side bracket doesn't line up with anything on the side of the engine. The distance between the bolt holes on the air filter is 20". The distance between the bolt holes in the top of the valve cover is 18". I'm guessing the air filter housing may be for a later model 2F engine? Not sure if there is some way I can make this work?