This block allows you to mount the terminator x max and terminator x ecu under the dash using some factory bolt holes just under the radio, all hardware is included with the mount for the ECU and attaching to vehicle. LED lights are still visible for diag. Also any purchase of this mount gives a 10 percent discount on the C10 ashtray 3.5 mount in checkout. ashtray mounts are here C10 Ashtray Mounts.