65 Dart Steering Colunn Firewall Plate

I seem to have misplaced a part of my car that I need to install the steering column.

It's the larger plate that bolts to the firewall where the steering column goes through. The smaller plate (which I do have) then bolts to the larger plate and holds the seal around the steering column.

Here is a picture of the hole in my firewall that it needs to fit.
View attachment 20150115_205427_resized.jpg

I've looked at a 66 valiant and it had a different size hole. Not sure about 63-64 cars.