Anything but one of those tiny chrome ones. Get the part in hand first and do some measuring. Looking at the pictures of the carb, it looks like the original equipment oil bath filter should be a drop-on fit, or that same housing can be converted to accept a modern paper filter without a lot of effort.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!