Add Matching Perch Spacer

The RSC perch spacer is an option for those that wish to increase the lever-to-bar distance.

The perch spacer moves the lever approximately 7.62mm(.3") further from the bar.

This can be useful for riders with long fingers, or someone looking to move the engagement point further from the handlebar, as well as add additional lever/cable throw. It also bumps the "friction zone" out a bit further from the grip for personal preference.