It's hard to see those pics but after a looking closely I see what you're asking...Yes, it looks like someone added the A/C blower motor section to your firewall...If it fits in the correct position in the heater box you should be OK...So are you saying that the section in question is seam-sealed in ??? .. The A/C blower motor does install from the engine compartment so you're safe there...There is a rubber seal that is installed on the A/C motor{mounts between the firewall and motor} and will have 3 rubber tabs and small metal washers to isolate the motor from the mounting nuts...