T40 2373-22g fru.91p7185 motherboard replacing

[MaoX]

hi all (i'm sorry for my bad english )
i've a t40 2373-22g with a motherboard fru. 91p7185 with a well known problem to gpu.
i think to replacing my motherboard but on ebay there are a lot of different models.
Can you help me and tell me where i can find all compatibily model of motherboard?
can i buy all 2373 model?
What i have to know to be sure that a motherboard is compatible with my thinkpad?
Thank you very much.