Description:D3 high torque auto-rotation clutch assy

Q: Are there any significance difference between Hirobo 0414-475 D3 high torque auto clutch assy and the EX high torque auto clutch assy?
A: D3 high torque auto clutch assy and the EX high torque auto clutch assy is almost same item.
The difference is the drag bolt size.  EX is 3mm drag bolt for main shaft.
D3 will use 3.5mm drag bolt to main shaft.
So, if you have a main shaft which has a 3.0mm hole, you can not use D3 high torque auto clutch assy unless you change the main shaft.