for G403 G603 G703 Roller Wheel Original ALPS Parts
ALPS encoders have 7mm, 9mm and 11mm.
As long as your encoders and the same height encoders use, precisions, accurate positioning, a sense of scale, feel very comfortable.
Scrolling page often involves jumping up and down, which can be solved by changing the encoders.

Specifications:
Height dimension: 7mm 9mm 11mm

Package includes: (Without retail package)
2x ALPS Encoders