In the last set of 3 pics you show this looks very similar to the B&M HotShift kit that used to be available. I had installed a couple of these in the past.

I've attached the B&M TransPak install instructions and on P2 you will find the drilling template reference location which I think matches what you show.

What I'm confused by is that the original photos you showed at the top of the screen are pointing to a different passage...so maybe just confusion on my part??? LOL