Additional mileage

I need a bolt on. I am on the website and a simple dropdown with BOLT ON as a selection would be convenient.
Alas I’ve been on this website for over ten minutes now and still none the wiser.
Plus yesterday, I called the helpline number and was directed to this website.
Surely an over the phone method would suitably expedite matters.
Anybody able to shine a light here?

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If you go to your ‘My Account’ page - - you should see an ‘Additional Mileage’ link near the top of the page.