The following is the part number for the 6mm Cymbal Stand Adaptor for the DB-90, which can be ordered directly from our Customer Service department:

Part # SX000030 (BOSS NUT).

To order replacement parts, please contact our Customer Service department at (323) 890-3700 x7705.
They are available Monday through Friday between the hours of 8:30am and 5pm Pacific Standard Time.