About Thinkpad Mini Dock 287810U P/N number?

[Thinkfunny]

Hi everybody,

I have purchased one Thinkpad Mini Dock 2878-10U but the P/N number on the dock I got is not 2878-10U. It is 62P4551. Did I get the right model? However, I can still use this dock with my T43. Please give me the information about the P/N number for Thinkpad mini dock. What is it for? I tried to search for model P on the lenovo website but I could not find it. Thank you so much.