The stock USA and Canadian pressings can't be linked to each other since the Canadian pressing has a different B-side. But the USA promo can be linked to the stock USA and stock Canadian pressingComment by RecordDragon:
Added extremely rare label variant from Columbia Records' Pitman, NJ plant (apparently, the only Warners' product pressed by Columbia plants during this period in '76 came out of Pitman, hence its own label fonts - itself a rarity viz Warners' - being used here.)
Both the tree-lined label and the plain label state 1976. The plain label will have been a 1980 reissue of the 76 release but came in a 'school desk' picture cover and probably was part of a major re-promotion of Warner company 7" product including Montrose and other rock bands and spread onto the Atlantic imprint which gave birth to various AC~DC and other rock bands reissues in the late 70s and 1980. Pic pending (for the cover).