We just got done with our first really hot weather of the year, and I found that when the cab was heated up, the OEM tray was hanging up on the rearward part of the E&G safe opening. I'm assuming the clearances get too tight when the safe expands from the heat. I even tried sanding the tray down a little to clearance it, but it didn't help. I ended up getting the same tray that @Johnkn got, and it works great. $13 on Amazon and it must have a little more clearance because it fits perfect. I just switched my handle over to it and it's great. Maybe Nick@Apollo-Optics can ask them to loosen up their clearances a little in the rear of the opening in the future.
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Bob - Have any pics of where it wasn't quite fitting?