ECU part number question

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Aug 8, 2010
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501
Olympia wa
Hello, I think I need a replacement ECU for my 85 Mighty Max 2.0 The ECU itself has 3 different sets of numbers on it, the first MD081123 then E2T53971 and finally 5225. My question is what does the 5225 represent as I can find several that match the first 2 sets of numbers but not the 5225. Does that one even matter? Thanks for any info.