Appreciate the reply, Pudding. Puts my mind at ease
I called the Skoda dealer who told me that the guy I'd spoke to ordered the wrong bearings, meaning the actual cost was going to be 114 euro instead of 46. I told him to forget it and that I'd only go to pick up the weird
WHT 000 360 B bolt. The bolt ended up being an eye-watering 16 euro, but it was worth it as I couldn't find it anywhere online within Europe.
I ordered the bearings online from the Czech Republic instead for 80 euro + 18 shipping (and also since they do 4 Litres of Shell Helix Ultra 5W-40 for only 30 euro
).
But the bolt I just mentioned isn't some ordinary bolt, it looks like it's critical for the oil flow/pressure. It has an O-ring to stop oil leaking at the bottom. It also positioned right next to the pump itself and seems to be connected to its flow. I wonder if I didn't replace it (as it's a stretch bolt) and it came loose, would I suddenly loose oil pressure? Just a rhetorical question, if anyone else is replacing/reinstalling the oil pump on their car, make sure you replace it ;)
I have attached some pictures of the used bolt (bottom) and the new one and where it goes in the oil pump, in case anyone finds these useful or knows anything about the exact function of it.
Close up of the where I think the oil enters/leaves the pump via the bolt:
Here's a picture of the oil pump and my friend pointing to where the bolt we found in the sump had fallen out off. I doubt the bolt that had fallen out had anything to do with the low oil pressure.
But this picture is also a good reference as to the position of the
WHT 000 360 A or B bolt and its positional relevance to the oil pump mechanism itself.
Also, I'm preparing to do the big end bearing change next week, will I need to buy special assembly lube or will some putting engine oil on them do just fine?