What is this part?

[FlameOut]

I bought this 72 K-10 a few months back and immediately started to dismantle it. I took a ton of pictures (so I thought) and used about a full box of ziploc bags to label and organize my small parts, but of course I can't find a photo of this thing and for the life of me I can't remember where it goes! I seem to have somehow lost quite a few of the photos, and gremlins somehow hid baggies of parts (that I can no longer find). I also can't see what the heck the battery try bolts to, and I'm missing the part that holds my accelerator pedal rod into the accelerator rod support. The little thing that is ghosted out in the Accelerator Controls 71-72. Looks like home plate in baseball. Are these reproduced?

The part on the left, that I blasted and primed, what is it??