Anyone know if any other armature will fit the origial G+ ?

Any other like.............an Aurora Speedsteer, Ultra 5, Super magna-traction, speed shifter or Blazin'Breaks......yep,, they all fit!

Have not tried it, but since a recent Tyco TCR car is a 98% copy of the Aurora Speedsteer I would guess this Arm would fit as well.

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I have used all kinds in G Plus; Tyco, AFX, Life Like. You just need to be sure that the shaft diameter will be ok with the pinion gears. Some Life Likes use thin shafts.
I use speed steer arms to make 4 wheel drive G Plus chassis as they have extra long shafts that will reach the front axle.

Amrac's work well and seem to be a little quicker.