Finally got the correct rear sprocket, tried all the usual places but I had overlooked Honda Classics. Looking for a stainless f/brake caliper piston and a couple of other items I typed CB350f in the site search bar and there amongst the parts was the sprocket. Ordered online Tuesday evening, delivered Thursday morning and the pegs fit correctly.
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I’ve been checking the placement of the various washers on the brake stay arm. The rubber washer had previously been fitted (apparently incorrectly) on the outside of the stay instead of next to the brake plate. Confusingly the owners manual shows it on the outside.
Also I initially thought the parts diagram of the stay at the swing arm was wrong - shouldered bolt, torque arm, 10mm spring washer, 8mm plain washer then nut. However I suppose this allows some movement of the arm whilst retaining some tension.