Thanks, Those are not the ones. The Isotemp OCXO36-54M is approx 2" X 2" X5" with an octal base. Corby ____________________________________________________________ Buy and sell stock online. Best online broker. Click here. http://thirdpartyoffers.juno.com/TGL2141/fc/PnY6rw1gl65bkwLqdXTZgogMUZ1rJMplvQuuR7fQP3gi0TtGhy8fv/