Could put in Ion spitfires, which almost the exact same as the factory ford option
That's what I would do also. You can cut the shroud to contour the rear window with a Dremel or something. You can also sync them if you go a little DIY on them.
Since they're a regular ION after you set your pattern you can remove the lighthead from the shroud, cut and cap the scan-lock wire, and then crimp the capped grey sync wire to the cut scan-lock wire going to the plug. Cut the plug off and wire your two lightheads together and now you have a pair on IONs with shrouds that you can sync with each other and all the other rear lighting. You could even swap the ION for a ION DUO, TRIO, or V-Series if you wanted.
They should really just make a syncable ION spitfire or sell the shrouds separately at a reasonable price.