Hello Steve,
I see you have a PE95 gen set. Which of these air cleaners best matches your?
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I'll put the three filters here together for an easier way to determine what looks like what.
Pete's is a modified WWII MB air cleaner. When his is bolted to the firewall the air outlet port faces the MB's carb or in his photo the PE95 engine's carb.
Now look closely at mine. With my bottom bowl clips facing forward like Pete's and my tamped lettering facing forward like Pete's my air outlet faces away from the engine.

This is a late WWII MB air cleaner with the raised stamped lettering. Not Pete's look just like this with the added shroud. Mine does not.
Now the folks that have responded say the WWII PE-95 air cleaner is basically a WWII MB air cleaner so that means that even though Pete's PE-95K is a early 1950 unit it still has the air cleaner based on the WWII MB and is not like mine.
Also take a look at this thread on the g503:
http://www.g503.com/forums/viewtopic.ph ... 91&start=0