No conversion needed if they are more than 25yrs old. We have to replace seat belts to meet Australian standards and change headlights. That's usually the bilk of it.
We must have 3point retractable belts up front and 3point belts in rear, our mounting bolts are larger as well. Headlights actually air in opposite direction than US ones(not upside down if that's what you were thinking)
I was thinking that maybe the color or intensity of the lights might have been a different regulation then in the US
I have no idea, my son loaded it on an iPad, I guess you'll just have to stand on your head:Handshake