***If you purchased unmounted stamps, they either came from  The Angel Company (which was a company that sold the sheets of rubber and the magic  foam mount that was sticky on one side for the rubber and cling on the other  side to stick to either an acrylic block or a stamp positioner.  If the stamps are from Stampin Up! They may  have the magic foam mounted, as I removed from the wood block to store in CD  cases, or they are still mounted with the stuff that came with the stamps, which is sticky on both sides.  Either   will work with an acrylic block or a stamp positioner.  Some of these stamps have been unmounted for20 years and the rubber and foam have held up perfectly.  Close to My Heart rubber stamps have  not  always held up so well.  The rubber is  fine but the material they used to mount to the wood blocks tends to have  broken down, and I don’t have any more magic mount to fix them.  You can, however, use double sided sticky  tape or a repositionable   glue which  will also work fine for you.  If your  purchase was unmounted stamps, I make no claims   about  the condition of the CD cases.  These  cases are very old and have become   brittle. Some are cracked.  The stamps themselves are mounted on foam  cushion and will   adhere to acrylic or a stamp positioner and  the images you stamp will come out just fine.