They were never sold fromt he factory in america with an electric roof. There is a kit you can buy but IMO its not worth it.
I nolonger have an electric roof, ive spent the last month converting it to a manual one. Theres ALOT of wiring for the electric one and all the windows go thru the rear computer (yes theres a separate computer for the roof).
It was a hassle converting it to a manul I cant see how it would be even possible to go the other way.
Also everyperson ive talked to that knows anything about them agrees with me that they are unreliable and a liability and thinks I did the best thing by removing it