Dynamat has a kit that is cut for 65/66 mustangs. I have that and it is pretty complete. Not sure how much it is but you can go to
The Official Dynamat Website
the guy to speak to is Paul:
Paul Sonoda
psonoda@dynamat.com
Product Management Director
Dynamic Control of North America, Inc.
The Official Dynamat Website
513-860-5094 Phone
513-860-5095 Facsimile
Paul is great to deal with. I would send him a email. If he doesn't get back with you in a timely fashion then call him. Feel free to drop my name:
here is a thread on another forum with several pictures of the kit installed.
HTH.
Richard.