Seats, Luggage & Exhausts:
Seats:
Seats can be changed between all models and there are several different seats. Below is a list of seats, the measurements uses the Standard 650 seat as reference.
Standard 650 seat (used as measurements reference, part#: 45100-27G00-H1N)
Standard 1000 seat (+20mm, part#: 45100-06G10-H1N for K4 onwards & 45100-06G00-W69 for the K2/K3)
Optional Gel seat (I have one and it feels higher than a standard 1000 seat, part#: 99950-62186)
Optional Low seat for Vee (+0mm apparently a standard Wee seat, but part# differs, part#: 45100-06G50-H1N)
Optional Low seat for Wee (-20mm, part#: 45100-27810-H1N)
Optional Tall seat (+40mm, part#: 45100-06G60-H1N)
There are aftermarket seats for the V-Strom, here's a list of a few manufacturers:
Corbin
Sargent
Bagster
Day-Long
You can also get your own seat modified by a local motorcycle seat builder/modifier so it's just the way you like it. This normally works out cheaper as you take in your old seat to be modified instead of buying a complete new seat.
Luggage:
There are 3 different rear luggage racks, the standard rack, the GT (aka Touring) rack and the XP rack. All rear luggage racks will fit all model bikes. The standard luggage rack can be fitted with various aftermarket mounting plates to fit matchings top boxes from other manufacturers (like Givi, Kappa, Krauser, etc.) That the XP rack has the rear indicators bolted to the sides of the rack and if you fitted this to a non XP bike you might need to extend the rear indicator wires (if someone knows that this is not the case then please let me know.) The XP rack is for use with the Trax aluminium top box. The GT rack is for use with a Suzuki OEM top box.
Suzuki sell side pannier rails, these bolt to the GT luggage rack and the rear footrest mounts. They are for mounting the plastic Suzuki panniers to. Because of the differences between the exhausts on the different model bikes the rear footrest mounts are slightly different. There are 3 different side pannier rail sets. All Vee models use the same rails, all K4-K6 Wee models use the same rails and K7+ Wee (twin spark) models use the same rails. The XP side pannier rails are for the K7+ Wee models only and needs the XP rear luggage rack and Trax aluminium panniers.
Suzuki sells a back rest for their plastic top box, you can order them from your local Suzuki dealer. The part# is 990D0-06G48-005 and they cost ~£28.
Exhausts:
All Vee models use the same exhaust, aftermarket exhausts use short link pipe and end cans. Note that the one side's link pipe is shorter than the other, paying attention to this during installation can save you from a WTF moment.
K4-K6 Wee models use the same exhaust, aftermarket exhausts use a short link pipe.
K7+ Wee models use the same exhaust, aftermarket systems are normally a full system including the header pipes.