I could be wrong, but I don’t think the 25-year import rule in the US has anything to do with what side drive the car is. It was a law passed in the 80s to shut down gray market imported cars. Importers would buy cars from countries where they sold for much cheaper than the US and then resell them for way less than official dealerships.
The law would’ve been targeting left-hand-drive vehicles, so the right-hand-drive stuff is just a byproduct of it. I mean, the US government had all of its postal service trucks built to be right hand drive.
Ah, that’s interesting — and makes a lot of sense.