I suppose some of the non-standard modifications are export market related. Don’t quote me but, some possibilities might include such mundane things as …

– Pull to flash headlamps in the turn signal lever
– Amber upper tail-light lenses
– Shoulder strap seat belts
– single license plate illumination bulb
– R/L headlamp focus

I believe the Book of Norman would cover the total list of possibilities. X is typical for North American market as far as I’ve seen.