I used these on another vehicle. You can use stainless steel wool in between the disk to tune the sound as needed. They also have caps you can fully or partially block off the center pathway. For my application I put them in without the wool and caps and it helped kill the drone...
I patched from the inside then used eternabond to cover everything on the cowl side.
Classic auto air so the vent isn’t used.
Eternabond is the permanent version of flex seal. It is used in mobile home roofing. 15yrs uv rating.
I don’t see TS-713T on their web page. You will probably have to call them.
I ordered the 70 mustang one at first as it listed up to 73 as models it fit. I called them to see if they had other parts I was missing to convert to our years. Nope.
They payed for a call tag to send the incorrect...
I had issues getting repeatable results at first
Come to find out the drought dropped one corner of the garage 3/4”
So when I drove in it never was the same.
Now I know that I have spots on the floor I have shims to land on and I verify every time I align it.
I started with all the quick...
Mine didn’t want to return with 4 caster due to the steering box being tightened to remove slop.
Went to a lares quick ratio and open tracker roller idler and it is perfect
Using the street performance specs
https://opentrackerracing.com/tech-info/
Also I seem the remember people saying the newer rear window weatherstripping was taller.
There was discussion of using mopar windows moulding clips as the distance from the pin mount to the clip was taller