Came across a couple of used ECB's at the boat club I belong to the other day and figured we could rehab them for use this season. They could use some new grates and thermometers. One of them is missing the factory one, the other has it's therm, but is probably crap. My question is, will one of the therms on available on ebay fill this hole? http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT Or do I need to fabricate something as a backer plate. Has anyone actually replaced one of these or just added a new therm to the unit?