Bought a used E-Revo, what are the "spares" ?

[miniGranis]

Hi all.
I bought a used E-Revo from a guy at Traxxas.com
It came with loads of "conversion leftovers"/spare parts, my problem is that beeing rather new to the Revo I dont have a clue what the parts are and could be used for.
I have taken three pics of the stuff that came together in different plastic bags. I dont know if all parts on each pic are from one item or if they are mixed.
The tuck having a tranny locked in 2:nd gear I assume I should have some optidrive stuff but which pic is that and what is the other stuff ?
So please help me idenify what you can on the pics below.
TIA

Edit: The pics are rather dark, I hope some still can help.