I think he wears those shades for about 10 seconds in the film, at the very beginning, when he tests out the large guitar amp. It's for the best that the sculpt wasn't modified to account for his wearing the shades, IMO. If it's a problem fitting on the sculpt, and if people really want to pose him wearing them, then they can just trim the arms to make it fit. That's what people did for the Trevor Grove sculpt, trying to fit the T-1000 shades.