Here are all the options parts for the Xray XB4 2020 and olders
Reference 06972031
Brand: XRAY
SILICONE O-RING 3x2.1 (10) - 972031
Reference 08293561
Brand: HUDY
HUDY ALU REAR WING SHIM (2) - 293561
Reference 06335031
Brand: XRAY
DIFF BEVEL & SATELLITE GEARS FOR O-RINGS - SET - 335031
Reference 06303122-K
Brand: XRAY
ALU SHIM 3x6x1.0MM - BLACK (10) - 303122-K
Reference 06303122-O
Brand: XRAY
ALU SHIM 3x6x1.0MM - ORANGE (10) - 303122-O
Reference 06305231
Brand: XRAY
DRIVE SHAFT COUPLING - HUDY SPRING STEEL - 305231
Reference 06930815
Brand: XRAY
BALL-BEARING 8x14x4 STEEL SEALED - OIL (2) - 930815
Reference 06323354-M
Brand: XRAY
COMPOSITE UPRIGHT REAR - UPPER POSITION - MEDIUM - 323354-M
Reference 06323357-M
Brand: XRAY
COMPOSITE UPRIGHT REAR - LOWER POSITION - MEDIUM - 323357-M
Reference 06364975
Brand: XRAY
COMPOSITE CENTER DIFF SPUR GEAR 75T / 48 - 364975
Reference 06362251-G
Brand: XRAY
COMPOSITE STEERING BLOCK CARBON EXTEN. PLATE - G - 362251-G
Reference 06303123
Brand: XRAY
ALU SHIM 3x6x2.0MM (10) - 303123