The spotlight was mounted wherever it could be bolted. Some crews mounted it on the top of the mantlet, some on the top of the counterweight. It was really only used for UNPROFOR, IFOR, and SFOR deployments. The hole between the hatches on the turret was part of an NBC system that the Brits never mounted on their CVR-Ts....unless the 8CH was drilling new holes in the turret!
You are correct about the SIMFIRE. A bracket was bolted to the front of the counterweight and the SIMFIRE attached to the bracket. The cable was run to the top of the turret and either down a hatch or through the hole for the NBC system.