spare part for 52/SX fader modules:
* 52-1020A, 52-1024A (needs 2 pieces)
* 52-1021A, 52-1025A (needs 2 pieces)
spare part for 52/RX fader modules:
* 52-2020A/B/C/D/M/N (needs 2 pieces)
* 52-2029A/C/M/N (needs 4 pieces)