Dexter, this is the air filter/spark arrester from a 1950, 216 but I think they were the same regular production item from 1932 on up.
http://www.pbase.com/dennygraham/under_hood&page=13 You should see a few pictures of the paper element next to the original one. Jon’s filter looks to be copper some were aluminum mesh.
Is there a number on the filter that you have in yours’ (usually embossed into the rubber)? It looks to be a very good fit for that unit
Denny Graham
Sandwich, IL