I've seen a few pics here using Marks system and I saw a post where someone had used the signals from the bumper and also mounted the signals in the grill. All will work I'm sure as do the system I used. It was actually copied from a pic I saw years ago from a member here "Flying Ragano".
I had to make a short adapter so the lens filled in the hole nicely for the inspection I had to do before getting insurance.
I hope this helps
perhaps others will share their methods as well