It must be a generational thing, but don't really like the look of our October, 2015 Model S P90D 21" Grey wheels; would prefer the Silver wheels instead. Thus, would like to swap our greys for your silvers as I think the match is better on a Midnight Grey MS. Ours have about 4k miles and are perfect; factory Michelins with excellent tread depth--staggered fitment only. Would much, much prefer a local, DFW-area swap so as to confirm no vibrations or other issues, and avoid the major hassles of having a Tesla with no wheels in the garage, and shipping such large and expensive items . . . .