The "Bergepanzer Tiger" was built as a Command Tiger, but it was converted to be a normal Tiger while it was still at the factory.
Command Tigers didn't have an MG hole in the mantlet. But when they were converted to normal Tigers, a normal mantlet was substituted.
Dragon's "Bergepanzer Tiger" kit provides a mantlet plug, part A28. But this "Bergepanzer" had a normal mantlet with an MG hole, which we can see in photos. You should not use this part.