Missing 'gasket' between spindle and dust cover on disc brakes?

[Clatterville trolley]

Currently in the process of reassembling the front end on a chassis I am building from ground up.

Using stock 1971-2 disc brake parts on a 70 frame.

When I took the spindles apart it seems that I remember a round gasket that was in between the spindle and the dust shield or maybe inside the dust shield before the spindle goes on???

Now I don't know where it should go even if I had a new one to install or could figure out where to order such a thing.

I thought I saw a photo somewhere of some dust shields for sale that included the gaskets and seems like they were from CPP originally. However, I already have dust shields and don't need any more.

Any help or ideas?