Need new used ecm 865926 ecm0501 for 5.oL

Looked the part number up and it is NLA, and does not list a superseding part number. If I knew the original serial number, open/closed cooling, Bravo/Alpha drive, can look up the replacement.

If you go to the link below and look at items 5 which are for all SBC for a given serial number range. Then hover over or select the magnifying glass and it will list what that given ECM is designed for. Doing this gives you the older and newest part number so gives you more search info

https://www.mercruiserparts.com/bam/...31850/11652/40