2008 530EXCR - #1 or #2 cylinder for top end rebuild?

So whats the deal with the different cylinders? I'm going to start the teardown tonight, but couldn't find the cylinder marking. Do I have to remove the cylinder to locate it? Also, does this just affect OEM pistons? Will a Vertex or Wiseco piston fit either cylinder? It's got 9700+ miles and ~350 hours on the OEM setup and its starting to burn oil. Was planning on going OEM again if the price isn't too prohibitive.

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