I'm looking for an air filter for a 1970s vintage Tecumseh HH 60-105079E. Existing (whats left of it) filter is plactic foam approximately 3-3/8' diameter by 2'' high/ I'm not finding it anywhere. Is there a part number for this or a retrofit to a paprer element? 
Thanks for any assistance you may offer.

I would try to find a parts diagram for the engine, either here on Jack's or elsewhere. There should be a model number for the filter on the diagram. If you cannot find a diagram, you could try to retrofit something.

Part # 84 in the below link,     part #31700 ?  :
 
https://jackssmallengines.com/jacks-parts-lookup/manufacturer/tecumseh/4-cycle-horizontal/hh-60/hh60-105079e/engine-parts-list-2 
 
 
 
 
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Thank you!