Here are all the options parts for the Xray XB4 2020 and olders
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 06323560
Brand: XRAY
CARBON REAR WING SHIM - 323560
Reference 06368046-T
Brand: XRAY
XRAY TITANIUM SHOCK STANDOFFS - LONG (2) - 368046-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
Reference 06303121-K
Brand: XRAY
ALU SHIM 3x6x0.5MM - BLACK (10) - 303121-K
Reference 06306200-O
Brand: XRAY
ALU SERVO MOUNT - ORANGE (2) - 306200-O
Reference 06323354-G
Brand: XRAY
COMPOSITE UPRIGHT REAR - GRAPHITE - 323354-G
Reference 06323355
Brand: XRAY
ALU MULTI ADJUSTABLE REAR UPRIGHT - SWISS 7075 T6 - 323355
Reference 06335081
Brand: XRAY
ALU DIFF PIN - HARD COATED (2) - 335081