Just had a chance to look at mine. On the left hand side, I removed the pipes from the air-con compressor. If you undo the single bolt, it'll come off. There is no thread in the two holes, just an o-ring in each. It relies on the bolt clamping the block down tight. I made a small rectangular plate just to sit on top, with a hole in the middle, where that bolt goes back in again....just to keep the dirt out.
On the right, yes, I removed the silver pipe from the canister, and fitted a "blank" fitting in its place....a nut with a metal bung in it. I can't remember what size off the top of my head....check the old fitting and it might have a size on it.
I left the bottom black pipes in place, along with the rubber pipes that go under the battery tray. I don't know where they go....but they aren't causing a problem, and if the two openings are sealed up....I just left them as they are.