They used the slip-on version in "Black Rover". Here are mine:
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Parts of Star Wars claimed it was the "zipper" version but I believe they were wrong. Tem is even seen wearing the slip-on version during fight rehearsals in this moment in the BTS footage:
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I actually own both variants and the rubber parts are nearly identical in person so I reckon both can work perfectly fine...but I can honestly tell you the slip-on version is the closest out of the two just by the shape.
Where did you get them? I am located in Germany and cannot find a dealer.... :-(