just need a reference point for what a correctly toe aligned cobra rear wheel looks like so i can get it close before i drive to alignment. thanks
Just eyeball it.
You will be fine if you are just cruising it up to the shop for alignment.
If you are worried, do as Sublime said and simply measure the front of the tires, and the back of the tires, and get it close / same.
You could always take something flat like a board and hold it against the side of the tire and measure in front of and behind the tire and adjust until you get the same measurements. Thrust angle might still be off but you could probably eyeball it when you stand back and sight down the side of the car or set up some string down the side of the car. Look up home alignments.