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BackOr can get it if you want. Putting everything together is a guessed value; could be done externally with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, without Boss.