It's good to have one. I think Cobras run about 50 percent with and 50 percent without.
Look at your windshield and see it you have the holes in it to mount one. If you do then you can make it out of thin stainless. Two or 2 1/2" wide, bend to fit the angle of your dash/windshield. I think it mounts to the windshield with 4-40 screws. You can mount it to the body with button head screws (maybe 10-32) and nuts or just #10 stainless screw into the fiberglass dash. Drill a small pilot hole for the screw to keep from breaking the screw off in the fiberglass. They may call it glass but it's tough. You can polish everything with Mothers Polish and make it shine.
The hard part is taking the windshield off and re-installing it.
That statement reminds me, install the bracket to the windshield before you install the windshield on the car. It will take a short screw driver to install the screws into the dash. If you use a screw to mount the bracket to the dash install the screw and remove it before you mount the windshield. You will have a threaded hole that will be easier to screw the screw into with a short screw driver.
I hope not.
The next time I remove my windshield I'm going to install one. But I have over 20,700 miles and no problem. I don't race but have seen 125 + a time or two.
I hope this helps and I did not confuse you.
Dwight
Go to a local sheet metal shop or mechanical shop and see if they will give you a small piece of stainless. Maybe they can bend it to a 90 degrees for you.