Jmyers1951,
These two parts were designed to do different things. The RA extension was designed to let the saddle clamp clear the servo motors when used with the newer tucked motor configuration and to extend the time before needing to do a meridian flip. If you have a tucked motor mount the RA extension allows 360 degrees of rotation on RA and DEC.?
A pier extension is designed to raise the mount for better placement for standing or tall visual observers and to increase the time available before needing to flip and reduce the chances of a tripod leg strike by a telescope with long overhangs.?
For best results you will find you need both upgrades to maximize the time shooting through the meridian and to reduce the chances of a let strike. When used in combination with the safety limts set specifically for your longer tube you can maximize you time on target before meridian flip and totally eliminate leg strikes.?
Of course you also may want to consider the need to tuck the motors for the absolute maximum freedom of movement of the G11 head. The improvement is significant but maybe you don't need or want it.
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Chip Louie - Chief Daydreamer Imagination Hardware
Chip Louie