Where to get a music sheet holder for SH-201

[JoysnSH201]

I recently bought a SH-201 and it came without a holder for music sheets.
I contacted Roland already here in my country, but they told me that they do not sell such device.
As the SH-201 has 2 holes with a distance of 40cm and each hole is 5mm in diameter, is it possible to use another music sheet holder?
Till now, I was not able to find one.

Maybe somebody had the same issue and found a solution? Or is the only way to go to buy some wood/plastic/metal and build such device by myself?

Thank you in advance!