Synology RKM114 rack accessory Rack rail kit

Rack mounting depth: 570 mm to 720 mm
22 series:RS422+
21 series:RS1221+
19 series:RS1219+, RS819
18 series:RX418
16 series:RS816
15 series:RS815, RX415
12 series:RS812RP+, RS812+, RS812
11 series:RS411
10 series:RS810RP+, RS810+, RX410
9 series:RS409RP+, RS409+, RS409, RX4

Rack mounting depth: 570 mm to 810 mm
20 series:RS820RP+, RS820+
19 series:RS1619xs+
18 series:RS818RP+, RS818+
15 series:RS815RP+, RS815+, RC18015xs+
14 series:RS814RP+, RS814+, RS814