Sponge / foam for mobility scooter (Brincliffe S11)

Any Sponge / foam for a mobility scooter battery case / holder.
To help secure the battery safely in a case when not in use.

Maybe an old foam sofa cushion or similar.

Minimum 27cm x 32cm x 7cm ish or bigger so I can cut it down to size.

Inquire flexible on pick up times
Thanks