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I believe I heard on Youtube (maybe NYK?) that Model 3 takes a different plug to S&X, so if buying a 3 do not order ones specified as being for S&X without careful checking.
Thanks for the link. I got a set of four of these today - might just leave a couple in the car and two in the garage. Anyway they do fit and twist to stay in place - in case anyone is wondering about the specifics of the design.