Here are all the options parts for the Xray T4 2018 and olders
Reference 06305254
Brand: XRAY
ECS (ES) DRIVE SHAFT CASE FOR 2MM PIN - HUDY SPRING STEEL™ - 305254
Reference 06305447
Brand: XRAY
HIGH-PERFORMANCE LOW FRICTION KEVLAR DRIVE BELT REAR 3 x 189 MM - 305
Reference 06305577-O
Brand: XRAY
FIXED PULLEY 20T - LOW FRICTION - GRAPHITE (2) - 305577-O
Reference 06305772
Brand: XRAY
OFFSET SPUR GEAR 72T / 48 - HARD - 305772
Reference 06305781
Brand: XRAY
OFFSET SPUR GEAR 81T / 48 - HARD - 305781
Reference 06305799
Brand: XRAY
SPUR GEAR 99T / 48 - 305799
Reference 06305823
Brand: XRAY
ALU PINION GEAR - HARD COATED 23T / 64 --- Replaced with #305973 - 30
Reference 06305878
Brand: XRAY
OFFSET SPUR GEAR 108T / 64 - 305878
Reference 06305882
Brand: XRAY
OFFSET SPUR GEAR 112T / 64 - 305882
Reference 06305928
Brand: XRAY
NARROW ALU PINION GEAR - HARD COATED 28T / 48 - 305928
Reference 06308277
Brand: XRAY
XRAY 4S SPRING-SET C=2.9 (2) - 308277
Reference 06308286
Brand: XRAY
XRAY 4S SPRING-SET C=2.6 (2) - 308286