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.