I need to replace the brushes on my 6 Volt starter. The number of the starter is 1107108 4K4. This is a 216 engine. The brushes in the starter now look like a rectangle with a hole in it. The listed brushes I have found have clipped corners. I don't suspect there is a great difference and both, I again suspect will work but will they? Next question, what is a good source for ordering these things? I haven't been overwhelmed with knowledge by the places I have checked so far.

Thanks

1946 1-ton Panel
1952 1-ton Comml. W/Grain Body