there was no vinyl on that piece, it's all plastic. i just roughed it up a bit to help the fiberglass stick.
yes, that is the correct cupholder. i had to lose the one thats towards the front, because my computer is underneath there and i needed a bit of room. i still have the one thats toward the back, and it works great for cans of soda, as well as smaller sized drinks. i just know that i frequently order large iced coffee's from DD's and that cup barely fits in, and is at an angle.