Quote Originally Posted by 35fordcoupe View Post
good point roger. It's metal, but I was hoping to not have to cut them. What are you thinking?
As Mike says, I think you'll be surprised how much visibility you get from a dark amber bulb for the signals without adding any type of divider, and I would try that first. You might lose more from your headlight power by reducing the area focusing the main bulb into the center beam than you gain in increased brightness in your turn signals - I think I would want a spare set of reflectors on hand before I started changing them.

If you do decide to segregate the lamps, I would think that maybe adding three or four tabs to your polished aluminum to fit through corresponding slits, and then maybe using something like JB Weld on the back side to secure them? You're not concerned with a total seal, just creating a contained volume shadowed from the main bulb.