Hi just had my 1996 mk 1 merlot fully refurbed including wheels. I am looking for new wheel centre caps with a 47 mm diameter, can anyone help ? Cheers Colin .
These are 45mm: MAZDA MX5 MK1 ETERNAL FLAME ALLOY WHEEL CENTRE CAP STICKERS DOMED X4 45mm BLK C | eBay
Supplier can make them to any size.
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Found some cheap and cheerful ones on e-bay for my 49mm wheel centres on my NA.
Google is your friend.
Would say āmeasure twice, order onceā as a couple of mm may all the difference re: fit!
Similar to these - then you can get stickers to suit;
4x Alloy wheel center caps centre universal rim hub 54x47mm Fits Vauxhall Opel | eBay
May also be worth ordering 2x sets, as I lost one following a spirited drive, so now I have 3 spareā¦
Definitely 47 mm and Gary from a company down south making them 
cheers colin .