You don't need them although the straps will fit your foot a bit different without them. I used the anti twist on my 82, but not on my 77. But I did check to see that the screws wouldn't bottom out in the holes before the cranked them down without the anti twist. I've also cut part of the anti twist off so they fit flush against each other without overlapping. Can easily be done with a sharp knife or a hacksaw. Just snug the vent plug down on the O ring without excessive pressure assuming you have an O ring on the vent plug when you screwed it into the vent hole.
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