Hi MrMike, thank you for the advice and availability of your product.

Your 30 feet quantity was enough to do both doors with lines around the arm rest as well as the back speakers.
There is just enough leftover to put on the length of the front dash as some others have done.
Here are some pictures of the final product, feel free to post on your website for the 05-09 Mustang owners that have the same problem.
It looks great, thanks again. Scott

A great looking affordable solution to the S197's faulty door liners.
05 - 09 Mustang door repair
30 feet Electric Blue welt in a 2005 Sonic Blue GT:
 

Hello MrMike: there are several inches worth of length that I can't cram in the crevice to save my life
so I have tried to cut the tab off entirely but hesitate to put glue on it. Is there a glue you would recommend? Thanks.

Dear Scott, “ V.L.P “ Says "Vinyl/Leather Repair" on the packaging.
It is in a small tube (1 ounce). The manufacturer is "Performix".
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I get mine at Ace Hardware.
Dries clear.
I use dots, not a continuous bead.
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Use caution with this product, it is NOT made from sunshine and organic flowers ;)
If you have any questions please feel free to ask,
Thank you,
MrMike