sorry, forgot about that. My Mustang was built on May 30, 1973. Mach 1, medium yellow, 351C, 2V, C6 transmission. Thanks for the info.
You would have to check with the organization your were going to have the car judged at the and that head judge. They should ask you for documentation (why you choose that style) and or you should offer it BEFORE any judging took place
Here we would rather focus on what (given our best efforts) on what was original rather than where each judging organization is at this moment since it can take them a while to catch up sometimes
Here is some additional pictures that might help you in your efforts. Wish the pictures was clearer but thing this should work with some additional homework on your part. Good thing that there are a ton more unrestored 73 out there than 71 or 72's
An April example I believe the oval can be barely made out (upper left hand corner of the oval)) where the arrow shows
And a June example showing the oval clearly
Though they don't look like it they are pictures of two different cars
Hope this helps