Mouser page for Keystone battery holders http://www.mouser.com/search/refine.aspx?Ntk=P_MarCom&Ntt=164161437 Mouser Catalog page http://www.mouser.com/catalog/catalogusd/647/2401.pdf Keystone drawing, with 20.49 mm solder pin spacing http://www.mouser.com/catalog/specsheets/keystone_107.pdf