EA Mirrors are the same shape as XF, EB/D mirrors are slightly shorter and more rounded.
With thw Wing do some measurments of an EA/D boot and an EF/L boot and compare them.
I cant see that it wouldn't fit.
i just went out and measured the rear width of my parents ef xr6 and my ed xr6 and there is bugger all diff, so i think on should fit on no prob, but honestly i dont think it wil suit the cars styling, i think the subtle duck tail boot spoiler looks great! good luck anyway!