The plastic was from the packaging of a small window A/C . The velcro was from Walmart for under $4 . Larger blocks can be purchased online from KIA / HYUNDAI parts sites at $40 for 4 . I place the item against the back of the rear seat(s) in the cargo area of the KIA Soul since there's only 2 . Did this with a 15+ year old dvd /cd changer in need of repair in a nearby city . It held in place . Have to get another A/C to have 4 blocks . 

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