Havis Shield C-EB20-1312-Piece Equipment Mounting Bracket Whelen Icom Brooking.
C-EB20-131
2-Piece Equipment Mounting Bracket, 2″ Mounting Space, 1.31″ Bend
Fits: Icom America ICA110
Icom America IC-F121
Icom America IC-F221
Icom America IC-F5021 transceiver
Icom America IC-F6021 transceiver
Used, good shape. 
M/A-COM/Com-Net/Ericsson/GE MGM450
Whelen TACTLD1