The foam looks close to what I sell- though mine is darker - pretty much black, not greyish like the photos.
Aside from the thickness differences (I can't tell if that is 1/2 inch and I sell 1 inch as well), the foam in the photos doesn't look to have any pressure-sensitive adhesive (PSA)on it (no protective paper on either side of the foam that I can see, which is required with PSA).
My foam is uber easy to use. Make a thin cardboard or paper template of the foam shape you want. Trace shape onto the protective backing paper (remember which side is "up"). Cut to shape - electric carving knife, bandsaw, whatever.
When you are ready to attach the foam, do the following. Make certain the area you are sticking to is clean and maybe sanded lightly- same you would do with anything you are gluing.
At the (usually) front of the foam, carefully peel back about 1/4 to 1/2 inch of protective paper and fold it over on itself.
CAREFULLY press down the strip of now really, really, tacky adhesive foam, making sure you are all lined up because you are only getting one chance. Slowly peel the paper back on itself with one hand, pulling it out from under the seat at the same time you are pressing the foam/adhesive down - slowly.
It doesn't get any easier than this. No stink either, like contact cement. The PSA is almost 100% solids, which means no solvents to gas off and make a smell.
So, similar to the photo, only darker and easier to use.
Pat Cowan, Pacomotorstuff