Outside of the Outback Motortek Pannier racks, we carry are on our site, we typically recommend Touratech. Happy Trails is great too! There are a couple of different styles of Happy Trails Racks that are compatible with our panniers.
Please checkout our Fitment Page for more info on compatible racks.
Wondering if you should run the 35L Panniers or the Offset Panniers?
For the 650GS-- choosing between our Offset Kit and our 35L Kit really comes down to personal preference. If you're concerned about the bike looking symmetrical from the front and rear, I'd recommend going with the Offset Kit. If you'd rather have the extra 10L of storage capacity, I'd recommend going with the 35L Kit. You can always cinch the exhaust side 35L bag down if it's not packed to capacity. Also, you only need our adapter if you have the stock rack on your 800.