I can't find a replacement window motor for my 88 900T convertible..as they are different form normal.

Does anyone knoe if the parts can be interchnged? ie: taking the electric part with the brushes from a sedan motor and putting that on the gear part of my convertible ones?
or does anyone know where I could get new brushes ?
Thanks Frank

I did once file some brushes to section. A bit messy but it worked well.

Yeah I did file some brushes from an old drill... worked for a while but stopped again...