They all seem identical but OEM and genuine have production part numbers on around the inner edge and there is more than one all are finely engraved, patten parts don't, unless poorly hand engraved (scratched) with something.
The OEM part I purchased came in a brown box and had a Britpart label on it, but as we know that also supply pattern and genuine parts and yes just under £60 including p&p.
Should have ordered a filter at the same time and would have got free p&p .