Welcome, and great choice of bike! Restoring to stock can be very difficult for cycle parts, front caliper is unique to the F1 and K7, and until Dave Silver had some replicas made, it stopped many restorations in their tracks. Good fuel tanks are also very hard to come by, F2 tank will fit, but must be used with an F2 tap as well due to different size fitting to tank. But don't let that put you off, they are great bikes. Stock exhaust systems are pure rocking horse dung as well.
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