The first one goes along the side of one of the valve covers because the top left piece is where the plastic loom clip pushes down onto it. I know mine has at least 2 maybe 3 on the passenger side and i think there might be one on the drivers side. These are sometimes removed when doing deletes to make the bay cleaner ?. I have seen a few cars without them. Cheers Dave
starter motor wiring retainer bracket bracket screws on to the bottom of your right side gearbox bracket with a 6mm bolt and onto one of the starter motor mounting studs[10mm]
the other ones i'm not so sure.I found something similar resting on the top of my steering rack when i pulled my motor. Dont think it was essential though cause it was running ok.
The other bracket bolts onto the oil filter head to secure the oil cooler return hose that comes from the sump.