I have not measured the 2016 MP3 500 seat, but from its appearance, I would say that our existing DS-XL size would fit it quite nicely. We lengthened the DS-XL by several inches last year to accommodate Spyder RT models and the Suzuki Burgman 650. The MP3 500 seat configuration looks very similar.
The DS-XL measures a full 50" in length and about 36" in width. Let me know whether this is large enough for your MP3. Of course, satisfaction with fit and performance is 100% guaranteed, so if it doesn't work out for you, we gotcha covered!
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