The upper rear arm is made up of a base rectangular shaped piece and an added pivot ball mount (coupled by a 4mm tie rod to give adjustability) which is included in three lengths. The shortest is used with the outboard pin position, the middle length is used with the inner pin position and the longest goes with the "A" lower block set which replicates the geometry of the 03 car, the setup sheet seems to ignore the latter option. Someone asked about the laydown servo parts - had a moment to look today and the plastic parts are included in the kit but all the fasteners, the pivot post and the ball bearings are not included, if you've been doing this game for a while most of the missing bits are probably kicking around your spares box already.