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Yz250 standard bore?

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I'm doing a top end on my 2005 yz250.  My piston is marked "A"   What size is the "A" piston?  All the online adds I see just say standard bore and give a measured size, but don't reference A, B etc piston size.  Any help is appreciated.  

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Get a vertex B  

cant link eBay from phone  

type: Vertex Piston YZ 250  

Or: 22584B

if you want OEM, they go by color think yellow is next size but can't remember as I use Vertex for years. 

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