Giro Disc is working on some. They will be more expensive intially but also quite a bit lighter than the OE fronts. They are working out a new design hat so they can make rears for all Mustang models. Then you will have replaceable rings that are not cross drilled
From first hand experience with Girodisc, I would steer clear from girodisc. It would be a major downgrade, granted oem is drilled but are of a higher quality.
Primarily in wear, girodisc discs just do not last as long as you would think.