Extras I would recommend are hinge pins, hinge pin inserts, aluminum steering servo horn from Tekno, and extra clutch bearings. The reason I say extra hinge pin inserts is from my experience when the hinge pin bends, it usually deforms the hinge pin insert changing the setting. I would stay away from the M2C throttle horn. I bought 2 horns and both of them would not fit on my servos without excessive force. One horn got stuck on my servo and the insert separated from the horn. I had to pry and dremel cut the insert off my servo. Luckily nothing got damaged. I was told the horn didn't fit nicely because of cheap servos, well I tried them again on my $180 ProTek Chad Bradley servos and still didn't fit and had to pry and cut the insert off my ProTek servo damaging the case a little. I would hate to see you have the same problem. I like M2C stuff, but the inserts used on the throttle horns don't fit worth crap. The stock plastic horn is plenty strong and I have never stripped one in the 3yrs I have raced my NT48. I am still using the original that came in the box