HD had the same kit. When I got it home the pieces were nowhere near the
same as what I needed, particularly the bottom piece with the cutouts
already for the flapper valve and the fluidmaster inlet valve. I hate
working with that white styrofoam shit anyways. It always seems to want to
break off some little white pieces that you can never seem to get rid of.
That's why I opted for this very bendable and tough foam. It's about an 1/8
inch thick and like I said comes in various widths. It is pink but ain't
nobody gonna see it in my toilet.
I tried the stryrofoam but the spray adhesive I used just seemed to
eat the syrofoam up. It got real soft, real quick.