Glenn,
May I assume by doing a frame off restoration you will attempt to return the car to as close as MONEY and availability of OEM parts will allow - if so, my kinda guy.
I trust you have invested in a Master Parts Book and a Shop Manual, both of which will become invaluable, along with a 17x24 laminated and color coded electrical diagram.
I have seen on line some after market pieces of rubber which were not made of the same original material nor the proper thickness, and the holes were misplaced with incorrectly sized - not worth the money.
The original exhaust hangers were made from old tire carcasses, even to the point they often showed parts of the white sidewall in them.
Do you intend to "rebuild" the remaining hangers (where the rubber portions are worn or missing) - if you have them all, which include the metal brackets, hardware, and their clamps - and are you ready to do some riveting.
If that is the case, I would invest in at least one - maybe 2 - 18 wheeler truck mud flaps.
The mud flaps should be the ones that have cord within for reinforcement, and they are the same thickness and flexibility as the original material.
You can then trace the insulators you need to replace, drill the 4 holes ea., hole saw the larger hole through which the exhaust pipe passes, and mount them with the hardware that was in the insulators you show in your photo.
There are a fair number of the membership who own 59's and have a wealth of knowledge and experience to offer up upon request.
By the way, WE thrive on photos, so don't withhold - post away at every step of your restoration adventure, and share with us your level of experience, so we don't talk down to you out of our ignorance.
Have fun,
Steve B.
My Avatar doesn't tell the story, but my member name does.
