I believe that is the "metallic" or "pearl" type vinyl....very typical for the era but by '71 or 72 the green vinyls changed to the "regular" type vinyl.
Yes, "dye" is paint with some flex additives.
Another option is to find some new vinyl (call Legendary or PUI) in that color and have the pad recovered. I've recovered a lot of these pads in the past with new vinyl. Won't use repro pads for my customer's cars....most are fairly hideous (I'm referring to the pads, not my customer's cars!).
Legendary and/or PUI would likely sell you a half yard or yard of the correct grained vinyl. Color should be correct but can't guarantee if it will be slightly off due being new vinyl against aged original stuff. Pre-mixed vinyl paint in that color will have the same "effect" as new vinyl....a potential slight mismatch since it's mixed to the ORIGINAL finish/color. I spray a lot of vinyl paints/dyes.....doing some of the gold right now on some '70 442 interior pieces.
That pricing is a bit crazy but Just Dashes isn't known for low prices
EDIT: When I mention "pearl" or "metallic" in relation to this that is just MY labeling of the look....GM just called the colors "green", "blue", etc but prior to '71 or '72 the gold, blue and green vinyls had the "pearl" or "metallic" look I refer to. I also call them "Jetson's Blue", green, etc...since the effect is sort of a "space age" look.