Description: Full Width Trunk Gas Tank Underlayment
Model: Mustang, Shelby, Sportsroof 63B (except BOSS 429), Mach 1 63C, Coupe 65B & 65D, Grande 65E, Conv 76B
Model Options: All
Transmission Type: All
Factory: San Jose, Dearborn, Metuchen
Accuracy Rating: 9
Best Repro Available: YES
The Mach 1, Grande coupe and all Shelby's came with extra sound insulation including this wider trunk underlayment that covers entire width of the trunk floor. Fastbacks <link> and Coupes <link> each had another unique piece of underlayment that covered the back of the trunk and the back of the seat back area. This underlayment is installed over the anti-rattle board and under the trunk mat.
We made our template from original surviving examples including cars from the Bob Perkins collection. The color of the paper side will vary as it did from the factory. This underlayment was installed paper side up.
Q: Will your underlayment crack and fall apart like the originals did?
A: No, we used binders in the tar that hold it together so you can put it in and out without it ever breaking apart.
Q: My original underlayment is a lot darker than some of your pictures. What gives?
A: The darkness of the paper varied in our original examples from very light to almost black. Our experience is that slight changes in the tar and the our shops ambient temperature during manufacturing effects the final color. Cooler temps will make the paper lighter and hotter temps will make the paper darker. Take a look a the last picture showing the two extremes in color variances. We shoot for the somewhere in the middle but you could get a piece that is closer to one of the extremes. Good news is all are correct.
Q: My original underlayment seems thicker than your reproduction. Are you making it the correct thickness?
A: Bob Perkins said the same thing when he first got his first piece of underlayment. If you look at an edges of original pieces they are swollen at the edges from years of heat cycles so they look thicker but when you cut down the middle of it you will find ours is the same approximate thickness.
Q: Wow, thats a lot of money for a piece of tar. Why does it cost so much?
A: Yes, we totally agree it's expensive but its not cheap to make. We make it ourselves in California with our own custom production equipment in small runs. The materials are not inexpensive and our partially automated manufacturing process is labor intensive. The size of the die and the equipment to stamp it out is another reason. If we could source the material itself from a mass production manufacture it would be a whole lot less but its just not available.
Don't forget you need the anti-rattle board that goes on the gas tank before you install this piece of underlayment.
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