Hey Claudiu,
Call Roland at 1-323-890-3745 and tell them you want to buy a music rack.
Please note that the music rack has (2) parts:
a) the metal base
b) the plastic holder
You must order both or they'll just send the metal base.
It will cost around $50 complete and $5 shipping.
zuki
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Live: Korg PA4X/Bose L1 Pro 8/Senn 935
Studio: Korg PA4X/Kawai MP7SE/Tascam DP24SD/Sony C80/AGK 214/ATEM Mini Pro switcher/