Enduro Engineering for the seat...I think. They may only do KTM. I tried checking, but, I think someone stole their web address. You can also try CEET. You can also just pull the cover and ad your own foam.
Let me ask on my bike forums for you.
Baja designs makes the HID kit on the black 650.
http://www.bajadesigns.com/
The wheels are Exel rims with Talon hubs probably around a grand for just that wheel set. That tank might be a IMS or a Clarke with a dry break. Plastic, I am guessing is Acerbis. Scotts steering stabilizer, Cycra ProBend Hand guards or might be FastWays (Cycra makes them for FastWay), Answer Pro Taper bar. Maxxis IT tires, (I run those, good cheap durable tire) That is about all I can tell from the picture.
I don't know what that front brake rotor is, not stock...looks like stock exhuast, that has the insert removed.