Looking this up on Webers site I am thinking this is a 00/01 Genesis Silver A
Crossover tube that you need is
http://www.ereplacementparts.com/crossover-tube-p-1476895.html - 83738 Crossover tube for the Spirit 500/Silver A
The two rails holding on the tray will be much harder to find as they are not even listed in the schematics, Weber may be the best bet.
Regarding the drip try itself, if the aluminum one is missing I just buy the foil ones from Weber and double up, it does the job.
That is a very nice little gasser, they put out a lot of heat for a two burner.