Check the listing for details. Ghostbusters 80% Spirit Proton Pack Shock Mount Attachment Movie Prop Replica. Listed at 20.00 USD. Up for auction is the above Ghostbuster's Proton Pack attachment:Shock Mount!! The Shock Mounts in this listing are for Spirit Halloween Store Proton Packs.These are 80% smaller than 1:1 full size Proton Packs. If you are looking for a larger Shock Mount for your full size pack, please see our other auctions.Side-by-side photos in the default gallery show comparison between full size and Spirit size. Our Shock Mounts are available in three variations:Original (silver) painted, unpainted, and weathered.Please see photos above and select which version you would like. These pieces are made according to Stefan Otto's plans on GBprops.com, with all measurements/specs reduced by 20%.Fabricated and machined from delrin plastic.Each Shock Mount comes with a 2" carraige bolt and nut. Check out our other auctions for the matching Ion Arm attachment! We gladly combine shipping.First Class Mail is always free. Priority Mail also available for an additional fee. Thank you for looking!