1979 to 1986 Fox bodies, "Four Eyed Cars" have readily available RHD headlights, 165mm x100mm, Landcruiser, Mitsubishl etc.
1987 to 1993 Fox Bodies, "Aero Cars" headlights were only available in RHD for new cars sold in Japan.
Similar situation for later SN95 Mustangs.
Have imported both a 91 Confvertible and a 95 GT from Japan and all lens had the Arrow pointing to the left, showing which way they dipped.
In the past, having owned five Fox Bodies, I have sourced RHD headlights listed on Yahoo Japan and also US EBay which were listed as export Items.
Same for KPH Speedometers, which can sometimes be found on Canadian eBay as they went metric around the same time as us.
That said, have also fitted a set of late SAE/DOT marked Clear six piece front Headlights from US Ebay that had minimal leakage to the right when adjusted and dipped. They were passed by a QLD Approved Engineer.