Some serious transmission help ASAP!

[stsintx]

after rewiring my ETAs I really thought that I can do anything so this morning, went under my SL600 and pulled out transmission pan, it was leaking from both pan and overload protection switch. Anyway i pulled out overload protection switch and this long cylinder, I replaced the o rings on overload pressure switch and the piston, but now I have two question, there is a spacer I dont know where this spacer goes and I forgot which way to put the pin inside the transmission. I am including couple of pictures so you can understand my dilemma.