1995 K2500 pickup 4wd with 6.5 non-turbo and 4L60e, info needed

Hello, I have a 1995 Chevy K2500 pickup with a non-turbo 6.5 but electronic injection pump and a 4L60E transmission.
Now, the truck is missing an ECU and I'm wondering what obscure part number or cal code I will need. Original ECU was damaged so no numbers legible and no PROM chip.

I previously thought that all of these 6.5 diesel trucks had 4L80E trans but apparently not. So I am in need of an ECU or a PROM or PROM image that will run the combination of 6.5 with Stanadyne electronic injection pump and a 4L60E transmission. I have a good ECU for a 6.5 turbo engine and the engine starts on that but since that cal is for a 4L80E the trans doesn't work.

Baldur