Partnumber 2958568!
I don't see an ecu connector, but do see dual field alt connector. The bulkhead connector is different from 70 A or B-body. So 70-72 E-body, 71-72 b-body. Truck? out of my scope but possible I suppose. I do see what you're saying about PN# though on ebay. There is also a 70-71 truck engine harness which has same bulkhead connector.
1969-1971 Dodge Power Wagon D 100 Used Under dash and Engine Wiring Harness | eBay