Hi Jean, see under http://www.korry.com the PDF documentation from the Chromalux 476 Indicator lights. In this document you can see the exact dimensions of one light (include tub). The other dimension from the panel you can find on my site under http://www.xflight.de/f16/pe_org_par_rxc_wpanel.htm Hope, it's helpfull for you Martin "Pegasus"