The Covercraft Carhartt SeatSaver Custom Seat Covers # SSC2463CAGY will fit the front seats on your 2013 Roadtrek 170-Versatile Motorhome perfectly, but in looking at that third seat it looks like it's a bit shorter so these will not fit that rear seat.
For something that will fit that rear seat you need a universal fit like the Aries Automotive Seat Defender Bucket Seat and Headrest Protector # AA3142G but the problem in going this route is that the gray colors won't match too well.
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