I know Wikipedia isn't always trustworthy, but they say that our Amigo WAS the MU in the Japanese market.
He's asking about the hardtop on the first generation Amigo. Isuzu didn't offer a hardtop on the first generation Amigos. That is, unless the JDM version had one. All hardtops in the US were 1) removable and 2) not original equipment, but aftermarket.