Alrighty... need an aircleaner assembly for my nailhead! I have one somewhat stock buick one (that will go up for sale here if anyone can ID it for me) that doesnt fit my car, so I am jsut going to get a chrome one for it. question. are the tops of carbs fairly similar to where its a one size fits all kinda deal...(5" 5 1/4" etc...) or are there model and company specific ones? thanks!