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The V7 Classic and the present range of V7's use the same, 5-hole gas ring. Most recently, I found that Hepco Becker had a similar setup except the bag mounts to the tank ring with two strong magnets and you just lift it off to remove it.............BUT, although they list a tank ring that is supposed to fit the Classic and the present models, it does not fit. How do I know? Moto Machine (the Hepco Becker distributor for the USA) has sent me two different rings and neither will fit. They're way too small and look like rings for a Breva. The package on the latest one says that it fits my V7 Classic and the V7 Stone, etc but it doesn't.
This is a little old but I got an H&B tank ring from Moto Machines that fits my 2016 V7 II Stone.It's item # 506.012-5 and I'll show a pic with the H&B Street Tourer M for size.They show a ring for metal tanks & one for plastic tanks.
Hey that's a really cool setup