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You can get a 1999 Mazda Miata fuel cap at any auto parts store.
The 1999 Mazda Miata is a returnless fuel system. It has a Fuel Pressure Regulator in the tank (above the fuel pump), and a snub at the end of the fuel rail.
It is hidden behind a plastic shield underneath the car, just before the rear, passenger side tire.
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There is none, except for Japanese versions if I recall.
The 2002 Mazda MX-5-Miata runs on regular unleaded.
The 2004 Mazda MX-5-Miata runs on regular unleaded.
The 2005 Mazda MX-5-Miata runs on regular unleaded.
The 2003 Mazda MX-5-Miata runs on regular unleaded.
The 2001 Mazda MX-5-Miata runs on regular unleaded.
Behind driver seat under insulation is a lid with screws, remove and youll see a fuel pump..... hooray
in the tank