The fuel rail features three threaded ports that are all tapped for 8AN ORB

This fuel rail is compatible with most Mazda 1.8L DOHC BP engines:

1994-1997 Mazda Miata
1999-2005 Mazda MX-5 
1994-1996 Eunos Roadster

Installation on a 94-97 Miata shown below:

If building a custom fuel setup, appropriate fittings must be selected based on the specific application. Ample space around the fuel rail port(s) is necessary for larger accessories such as fuel pressure regulators, fuel pressure gauges, and fuel pulse dampers. To verify clearance, the dimensional drawings on the product pages can be used as a reference guide.

20-0422 Fuel Rail Plumbing, 94-97 Mazda MX-5 

 This add-on kit permits a plug and play replacement for the OEM system on 1994-1997 Miatas. The OEM fuel pressure regulator is retained and the fuel feed and fuel return hoses are replaced.

20-0423 Fuel Rail Plumbing, 99-05 Mazda MX-5 

This add-on kit, shown below, permits plug and play replacement for the OEM system on the 1999-2005 MX-5. The OEM fuel pulse damper and fuel feed hose are retained. NOTE: If equipped, the EGR must be removed for the OEM fuel pulse damper fitment.