I'd say it's aftermarket. AFAIK Japan didn't get sunroof models, they had t-tops or hardtops. I think sunroofs were a UK (possibly US) option only. Toyota moves in mysterious ways, Japan had t-top and hardtop options, UK had t-top or sunroof options, and Australia was t-top only. No idea what the yanks had to choose from.
Post some pictures of the hinges. The UK ones weren't powered, it was hand operated to pop up at the rear or be removed totally. Obviously no pull across option for a shade unless you want a retractable scroll type jobbie, the UK ones were a hard card type the same as the t-top shades. The one in your pics stands very proud of the rest of the roof, the UK sunroofs sit flush.