The new version of the shock shafts has a shorter thread so that it can go deeper into the new shock shaft end. This protects the critical transition from the thread to the shaft.
Set with 2 shock shafts (long or short version) and 2 shaft ends.

Shaft end dimensions
Length: 26.5 mm overall, about 22 mm to center of bushing
M4 thread for shock shaft, M3 for piston
Bushing i.d. 4 mm

Shock shaft length: short 64 mm / long 77 mm
Thread size for shaft end M4, for piston M3
Shaft diameter 4.5 mm