There was only one OEM set for F650GS single, characterised by having a very fragile aluminium decor panel. After 2008 the F650 became an 800cc twin, and none of those will fit the earlier bike.
For what it's worth, I'd look for a set of aftermarket top-loading panniers as the originals were side loading and not too large.
Also try F650.com if it's still running; dedicated forum for that bike.