I got both the fuel filter and shut off valve on ebay... total cost with shipping was $10 or less. I really like being able to cut the fuel without having to give up the vacuum operate petcock for when i drop the bike in the woods. Not to mention you can do this modification in 5 mins without any tools other than a pocket knife. Heres what mine looks like: had some blue gas line laying around that i cut up. The 90 degree shut off valve is a must, the only way to get it to fit without a loop in the line.