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 06363511
Brand: XRAY
LEXAN REAR WING 1.5MM (2) - 363511
Reference 06364978
Brand: XRAY
COMPOSITE CENTER DIFF SPUR GEAR 78T / 48 - 364978
Reference 06365353
Brand: XRAY
ALU WHEEL HUB 12MM - V2 (2) - 365353
Reference 06365357
Brand: XRAY
"ALU WHEEL HUB 12MM - OFFSET ""+2.25MM"" (2) - 365357"
Reference 06940512
Brand: XRAY
BALL-BEARING 5x12x4 RUBBER SEALED - OIL (2) - 940512
Reference 06369902-H
Brand: XRAY
4WD FRONT WHEEL WITH 12MM HEX - WHITE - HARD (10) - 369902-H
Reference 06323513
Brand: XRAY
LEXAN REAR WING - RANK - 323513
Reference 06363512
Brand: XRAY
LEXAN REAR WING 2.0MM (2) - 363512
Reference 06329913-H
Brand: XRAY
2WD/4WD REAR WHEEL WITH 12MM HEX - WHITE - HARD (2) - 329913-H
Reference 06303122-K
Brand: XRAY
ALU SHIM 3x6x1.0MM - BLACK (10) - 303122-K