Here's some rough measurements. Roughly 2-7/16 on the lowest side. As the pics show I pulled the upper bezel but did not remove the boot or it's retaining plate so you can add the thickness of those to the depth as appropriate.
These aren't exactly precise measurements but if you need something better let me know.
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'09 Magnetic Gray Metallic G8 GT
'79 T/A Solar Gold Metallic W72/WS6
'71 GT-37
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