Hi, I'm searching to purchase brushes for my Sanyo Denki DC servo motors. I have 4 in total, each taking 4 brushes. These are as follows:

2 motors Type: U730-012E
Lot No:09501N
Specs: Power 300W, Voltage 75V, Current 5A, rpm 3000

And

2 motors Type: U718-012E
Lot No:09521N
Specs: Power 180W, Voltage 75V, Current 3.4A, rpm 3000

So far I have been unsuccessful in my search to buy such brushes, so I would greatly appreciate if anyone could give me some pointers or if has any in stock and would like to sell.
Thanks
Marting