Here are all the options parts for the Xray XB4 2020 and olders
Reference 06303142-K
Brand: XRAY
ALU SHIM 3x5x0.5MM - BLACK (10) - 303142-K
Reference 06368201
Brand: XRAY
REAR SHOCK ABSORBERS - BIG BORE - SET (2) - 368201
Reference 06363113-M
Brand: XRAY
COMPOSITE LONG SUSP. ARM REAR LOWER RIGHT - MEDIUM - 363113-M
Reference 06364102
Brand: XRAY
XB4 SOLID AXLE - SET - 364102
Reference 06362251-M
Brand: XRAY
COMPOSITE STEERING BLOCK CARBON EXTEN. PLATE - M - 362251-M
Reference 06363114-M
Brand: XRAY
SUSPENSION ARM REAR LOWER RIGHT - 3-HOLE - MEDIUM - 363114-M
Reference 06363124-M
Brand: XRAY
SUSPENSION ARM REAR LOWER LEFT - 3-HOLE - MEDIUM - 363124-M
Reference 06971032
Brand: XRAY
SILICONE O-RING 3.2x0.8 (10) - 971032
Reference 06368045-T
Brand: XRAY
TITANIUM SCREW SHOCK PIVOT BALL WITH HEX (2) - 368045-T
Reference 06364962-L
Brand: XRAY
GEAR DIFF OUTDRIVE ADAPTER - LIGHTWEIGHT (2) - XRAY
Reference 0148202
Brand: HIRO SEIKO
XB4'18 Titanium Hex Socket Screw Set - 48202
Reference 0148401
Brand: HIRO SEIKO
XB4'19 Titanium Hex Socket Screw Set - 48401