Just an fyi, if you want better breathing for the dry based element air cleaner on the '47 to '55 3100's (perhaps more models), there is a K&N air filter that does fit the circumference of the base. It is approx 1 to 1 1/2 inches higher but all you need to do is to add an extender nut onto the exsisting stem and find a screw that is the same thread, cut the head off so it's above the top of the canister and your ready to go. The beauty of this is that it would take 3 minutes to put it back to original condition for show!
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