Google search for cm82 lamp turned up
stevenengineering.com/Tech_Support/PDFs/27MAIN.pdf on first hit. Download the PDF, search for "cm82", it's on page 198.
Double contact bayonet bass. Overall length 1.44 inches max, diameter 0.750 inches max. Design voltage 6.5, 1.02 amps, MSCP 6.0, life hours 500, filament type C-2R.
Maybe this helps.