All you need to do is cut the old foam to size, yank out the old stuffing, and push it into place. As with the pet bed, shredding your memory foam might make it easier to stuff inside.

Or, if needed, purchase something like the Juvale Foam Blocks for Crafts that you can cut to size and shape. You'll also need to have a sharp utility knife on hand to cut the foam, ...

13Using 12-inch foam cut to size, Lopez adheres the piece to the seat base foam using a general purpose adhesive (one that doesn't have any chlorinated solvents in it so it doesn't eat the foam ...

Foam: Cut a piece of foam to fit the width of the gap and slide it into place. Opt for a dense foam for enhanced durability. ... Select the size that best fits your car's seat gap.