What are the dimensions for the plastic case that comes with the KSM137 or KSM141?
The protective carrying case model numbers for the KSM137 and KSM141 microphones are:
Microphone - Carrying Case Model
KSM137 (single) - A137C
KSM137 (stereo pair) - A137SPC
KSM141 (single) - A141C
KSM141 (stereo pair) - A141SPC
The dimensions are 9-3/8" x 8" x 2-1/8" as indicated in the picture below.