yes thats what it looks likeHang on the serpentine accessory drive set up. They likely are worth good money on the Oldsmobile forums. It's the only factory Olds serpentine belt drive produced and I believe it will bolt up to an Olds V8. It was definitely a rare set up. Guys over on ROP are using the diesel V6 reverse rotation water pump and fabbing up thier own brackets.
Does yours look like this?
https://www.google.com/search?q=oldsmobile+v6+diesel+serpentine&espv=2&biw=1536&bih=769&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAmoVChMIvemj-ojAxwIVB9SACh3yVAOv#imgrc=yl9Ox_Eu5UOR9M: