I ordered the seat concepts standard height/density foam and cover for my '13 500xcw.
Its a nice product but only 7 1/2" wide at the widest point, the same width as the oem seat pan.
I liked it for short rides when standing most of the time but for joining trails with hwy stints of 50km + it wasn't comfortable enough for me
Since I'm in Cambodia it wasn't viable to send it back so luckily the labor to modify it is cheap here.
Browsing around I came across http://www.fishersaddlebags.com
and decided I liked the design of their 9" wide seat using the OEM base and adding to the OEM foam
So the next step was to wander down to the local motorbike upholsterers and see what they could do.
Cant buy good quality foam here so we cut up the oem foam to add to the seat concepts foam
They made a new (larger) cover from scratch and copied the lines of the seat concepts cover
Stretched nice and tight and well secured
Spot on 9"
Cost was $15 for 3 hours labor and materials, plus a tip