A TS-0402-1006 fuel rail adaptor can also be modded to allow a ex reg on the stock rail
As per above, remove the section that seals the return port and file it smooth and pop it in.
Also FWIW of the Three Major AM Fuel Rails out there (PW/PM/Aeroflow aka China) The only one that won't direct fit with a Nizzer Plenum is the PM unit, and also FWIW the fuel inlet fittings on the PW unit are on a silly angle.
A PM rail will fit if you get 90deg -6 an's welded to the ports on each end.