LRX = (left hand drive) (roadster) (non standard) cars that went to the USA had the X as they ran differeent lenses and lights for plates. There were several designations for cars that were export.. but they didn’t use X as they ran same spec as the UK cars.. there are LRO, and RRO cars.. left hand drive export (eurpoe, france germany etc..) and RRO right hand drive export cars (AU/NZ etc)