Rushmore Lowers ID
 

Anyone know offhand what he inside of the rushmore lower speaker pod diameter is? I want ot order some spacers and I'm at work.

They use a 6-3/4" nominal speaker size. From my notes during install, mine are 2014 first model year so no guarantees these have/haven't been revised by MoCo:

The speaker pod ID is in the 5.7" - 5.75" range (cutout diameter)

Speaker mounting screws mount at bout 6.2"

Max grille OD is about 7"

Speaker pod OD is just at or a hair over 7", maybe 7.1"

Thank you that's exactly what I needed to know.