Hey everyone! I've been good for a while but the other day I went crazy and bought some stuff on ebay. I am not quite sure if I'm wasting my money. First of all I'm getting a seat post, saddle, and a headset, all new in box. I have a track bike but it has a low budget no-name headset. The one I bought off e-bay is way higher end...but will i notice a difference? How much do u think a shop whould charge to install a headset? My old headset is almost new still. I hope the seat post fits. It SHOULD...but you know how that could go wrong. I also bought a used Nitto stem, it claims it is a 25.4 but on another site I saw the exact model and they only listed it as 26.0. What should i do? I haven't recieved it yet though.