Chrome Push In Breather Cap with no nipple needed

65 Dartman said

The Commando/Charger 273 use them in non-CA emissions; besides my Commando valve cover, I have one for my Offy Slant valve cover. Got them off eBay

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Nope. Charger Commando covers had stove pipes for the oil fill/vent caps. In 67 they had a grommet for the pcv but that's as close as it got. Summit should have what you need.