It is apparently a tight fit (mine are still in shipment....) and you can either unscrew the bottom case so the wires can be pulled out the base while it is inserted, or others have loosened the frame screws and yet others have sanded/filed a small amount to allow easier fitment. I will be going for option 1 so not to reduce frame strength and not have to worry about loosening the frame.

Oh, and the Hitec HS-65HB is the 'Karbonite' gears, the HS-65MG is the Metal gears. Personally I am going for the 'Karbonite' as think this will be more than ample for my requirements and only 2/3's the price...