A few missing parts for my automatic to manual swap

Upon going back through the list of parts that I need to complete my swap, I noticed that I'm missing 3 parts, and was wondering if they are absolutely needed. I've circled the parts here:

http://i.imgur.com/jmVzTjy.png

I feel completely stupid for looking over them when I was stripping my parts car.

Also, the only other problem I'm having is the "doughnut steel ring" mentioned in the "How-to" guide on Xenon's site ( http://www.xenonzcar.com/z31/autotomanualswap.html )

Any tips on getting this thing out? I've seen people use a slide hammer, someone mentioned jamming a socket in there that just barely fits, and then packing grease in there to push it out....but it definitely has been the hardest part of this swap so far. I bought a cheap slide hammer, but can't seem to get it to clamp down well enough to be effective.