Fuel line should be 8 or 10mm, i used micro bore central heating stuff from B&Q, ran 2 lines 1 for a return if needed or if i want to go fuel injected, would be worth using the much stronger injection rubber hose to connect the pipe work that way you are bulletproof for the future.
Brake lines are pretty standard at 3/8ths or equivalent.
Make sure your fittings are correct for the calipers.
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