I'm in the process of reworking the Cruise Control amp in my '85 300SD. There are 4 main power transistors with copper heatsinks on them. Does anyone know what the transistor part numbers are supposed to be?

I've cross-referenced everthing else but the part numbers are so obscured I can't tell what they are, primarily thanks to the corrosion inhibitive coating that removed the numbers.

Thanks for any and all help in answering this question for me.

Tim