Welll, since racing-minded guys are the ones that are ultimately responsible for designing and OKing this stuff, ThunderbirdJunkie's thoughts on the matter are that they probably figure shock rebuild kits are essentially a disposable wear item, which is probably why RTRs (in almost all manufacturers) come with different shock hardware than the kits (this is most prevalent with Losi's XXX-based RTRs), as noted by Ryno with the difference between the black and white O-ring spacers. ThunderbirdJunkie is fairly certain the actual O-rings are different, too.

To ThunderbirdJunkie, this would be a great time to buy the FT V2 shock bodies, caps, and a V2 rebuild kit

BTW; thanks for being mature in the discussion (to everybody), because far too often people have gone way off on folks for maturely expressing their differing opinion...this is why this is ThunderbirdJunkie's favorite thread on Tech