Not sure what the difference is between the JDM and USDM side mirrors, but the FL1 Spoon side mirrors did not work out for the USDM FL5. I have seen elsewhere that they worked on a JDM spec, and did not seem to have any issues with fitment.
Will they fit USDM? Yes, to a degree. Will they line...
TE37 Saga S-Plus 18x9.5 +39
Michelin PS4S 265/35/18
Swift springs
Honda OEM carbon spoiler, door inserts, center console, and door sills
TTD Craft carbon steering wheel
Mugen carbon shift knob (removed)
Hybrid Racing short shifter and competition rod
Antigravity ATX30-HD battery
Mele designs...