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mrpotatohead, it is a home made template. I used a scale and laid it across where the markers are, then cut with a home made battery charger hot wire. Shaped with a cut off wheel on a grinder. This foam will have a 1" thick sheet of poly fill glued on top. I did a dry fit of the upholstery, fits nice.
mrpotatohead, I have a stock "67" seat foam here. Pretty good shape other than being 50 yrs old. The height on the foam measures 6.5". On the "66" it measures 6". Worse condition overall. I believe they are exactly the same other than that.
Foam Factory
1 qty HD36 High Qual. Foam- Half Sheet-82" x 36" x 1"
11 qty Fiber Fill Medium - 1" Thick 60" Wide x linear ft.
1 qty Lux High Qual. Foam - Third sheet -82" x 24" x 5".
For the "67" I would go with the 6" thick foam and 1" Fiber fill.
I bought extra Fiber Fill Medium. ^