The first one looks like a short 2MT pen mandrel. The others I don't have a clue.
Steve, the four strips of steel are for putting under your leveling screws. It is important to get the lathe level.
Steve, I just leveled my lathe and did not bolt it down. I feel that if you have a large out of balance piece on the lathe and it is bolted down solidly, something else may give. The 850 lbs or so of the 2436 sits pretty solid on the floor.
Joe