Here are all the options parts for the Xray XB4 2020 and olders
Reference 06368191
Brand: XRAY
FRONT SPRING-SET L=42MM - 1 DOT (2) - 368191
Reference 06306208
Brand: XRAY
ALU SERVO MOUNT - BOTH SIDES THREADED - 306208
Reference 06364941
Brand: XRAY
STEEL DIFFERENTIAL BEVEL GEAR FOR LARGE VOLUME DIFF 41T - 364941
Reference 06368022
Brand: XRAY
ALU SHOCK SPRING RETAINING COLLAR -2MM (4) - 368022
Reference 06363310
Brand: XRAY
ALU REAR LOWER SUSP. HOLDER - FRONT - 7075 T6 (5MM) - 363310
Reference 06365226
Brand: XRAY
FRONT DRIVE SHAFT 84MM WITH 2.5MM PIN - 365226
Reference 06303127
Brand: XRAY
ALU SHIM 3x6x4.0MM (10) - 303127
Reference 06361190
Brand: XRAY
GRAPHITE CHASSIS BRACE DECK - REAR - 2.0MM - 361190
Reference 06361191
Brand: XRAY
BRASS REAR CHASSIS BRACE WEIGHT 40G - 361191
Reference 06364122
Brand: XRAY
ALU PLATE FOR MULTI-ADJUSTABLE SLIPPER CLUTCH FRONT - 364122
Reference 06364123
Brand: XRAY
ALU PLATE FOR MULTI-ADJUSTABLE SLIPPER CLUTCH REAR - 364123
Reference 06364141
Brand: XRAY
ALU PLATE FOR MULTI-ADJUSTABLE SLIPPER CLUTCH CENTER - 364141