The main bearings (
: Kampiakselin laakerit) are car parts which can be found inside the garage at home. They are attached to the engine block, over the crankshaft, with 2x9mm bolts each.
Each bearing is numbered and will only fit its designated spot. The #1 bearing goes on the gearbox side of the block (the flat one), the #3 goes on the belt side (the one with protruding threaded rods).