Heater A/C box washers

[Tims69SE]

Odd issue with the installation of my heater A/C box on my 69 Charger. The car was disassembled 2 years ago for restoration and is a factory all original car. The car is back from paint, the heater A/C box is rebuilt and ready to install. I have the 5 factory nuts that i bagged when I disassembled along with these 5 washers. I have not seen these washers on any other cars and checking with my restoration shop who primarily works on mopars has not seen these washers before. I also see no need for the washers, the factory nuts have washers attached to them. Has anyone else ran into this before?

 

[gtx6970]

They go on the stud before the box goes in the car. I think its more for support than it is anything else.
And they are only on factory air cars

 

[Jerry Hall]

They go on the stud before the box goes in the car. I think its more for support than it is anything else.
And they are only on factory air cars

Thanks, I just learned something. Having not pulled a factory A/C box before other than one I parted out I didn't realize that.

 

[Tims69SE]

They go on the stud before the box goes in the car. I think its more for support than it is anything else.
And they are only on factory air cars

Thanks gtx, I will be installing the heater box this weekend and will see how it works out.