273 Commando pistons

Hi, did all 273:s come with pistons that has four valve relieves in them. Engine in question is a 1965 one. My 67`273 commando had them. Can Commando pistons be identified by other means? numbers or measurments perhaps. Cheers Ubbe.
Commando pistons had a dome and 2 valve reliefs. Will add pictures later...

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