How to get blower motor to seal?

[LovetheA's]

I thought reinstalling the heater box, heater core and blower motor would be an easy job. I don’t know what I’m missing or if I’m overthinking it? I can’t seem to get the blower motor to seat correctly against the under dash insulation. As a result the 4 long anchoring bolts don’t push through the firewall enough to secure the motor from the engine bay. Maybe the order with which I’m using the spacers and foam padding is incorrect? I know on the back of the heater box there are 4 long studs, then 4 spacers then washers then that goes through the firewall. In the engine bay the studs stick through the firewall along with the heater core tubes. It looks like the wiring coming off the blower motor is preventing me from fully sealing the blower motor to the insulated padding under the dash. If you look at the photo of the blower motor through the fire all you can see where the foam gasket is pushed forward due to the wiring. Am I missing something? How does the wiring off of the blower motor get routed?

 

[Dubob]

The round donut seal goes on from the engine bay side. There is a retainer plate that pushes against it. This is my 71.

 

[Joey4speed]

Not sure whats going on under your dash but this is how it should utimately fit, hope it helps. (69 Dart):

 

[burdar]

Can you post a picture of your entire heater box with the blower motor installed? On my 68, it doesn't look like there is a seal around the motor on the back side. There is just one on the outside retaining plate. The four spacers that go on the studs should stick out past the motor wiring...so the wiring should never be able to touch the firewall.