Success.

Well Home Depot has nothing in its webpage under motor brush or brush
motor, and under brush, it has 52 brushes, but all for painting and so
forth. It also has nothing at the local store, even in the area with
partitioned boxes of specialty screws.

Lowe's has only one item in the online catalog, a set of brushes for a
Dremel too;. The closest store is about 5 miles and so I went to the
local hardware store first.

And the one remaining hardware store on my local shopping street has,
in its stack of partitioned boxes of specialty screws etc. 3 whole
boxes of brushes, with about 16 sizes in each box. So about 48
different sizes! 48!!! Maybe more.

Thanks, Edwin.

So even though I only went to look, until I can take apart teh motor,
I bought a pair. 1/4x1/4x1/2"L, but a little longer than that because
there is a circular stub sticking out, around which goes a spring.

They also had 1/8" longer, which would correspond to the length I was
told, but maybe it would be too long with its round thing. Given
that the first brushes lasted 14 years, I think the new ones will last
11 years even if I got brushes that are shorter than they should be.
And frankly, though there is nothing much wrong now with my 95
LeBaron, I don't expect the car to last 11 more years. (I always plan
to keep my car for 20 years, but I've never made it past 7! (total, 14
years old.)

And I can probably go exchange them at the last minute anyhow, once I
open the thing. There were several more pairs of each length.

But I bought now on the wierd possibility they could sell every brush
my size before I get back there. Or get rid of brushes when they
rearrange their space, as they have a couple times in the last couple
years (frankly, selling less hardware, and more space for garden
supplies, or renting power equipment, small and big), or even go out
of business (I sure hope not.)

$3.71 each. Complete with the necessary braided wire coming out of
the tail end, and a spring around that (which I will probably remove,
because this motor has its own springs)

Let's hear it for real hardware stores, instead of home improvement
centers.