I have a 94 E320. I have removed the blower and the plastic piece under the blower. I have removed all the torx screws I can see but there is a still a plastic piece over the heat sink that bends but wouldn't come off. I had to first remove the regulator off the sink and then remove with great difficulty the heat sink by tilting and turning.

I now have a new regulator that is factory mounted on the heat sink. Is there a way to insert the sink with the regulator attached? I am afraid that if I remove the regulator, I would disturb the Thermal paste and risk damaging the regulator. After spending quite a bit of time, I am at a loss. Would greatly appreciate your help. Thanks.