SB Pulley Help Please

I wasn't getting any help in my WANTED thread so I thought I would start another to try and find out what water pump pulley I need. Here is what I'm trying to clean up.



The previous owner used a mis-mash of various pulleys and hardware store items to get everything to line up. I dug through my junk and and found a good single groove crank pulley. It is actually a BPE #4011. According to their page, I need a #4015 which looks like this.



BPE Website

This appears to be a pretty common pulley that according to their website that fits "'70-'91 A-Engines w/ aluminum water pump, '87-'91 3.9L V-6 Engines, Magnum Crate Engines, All w/ or w/o P.S. & w/o A.C"

I would rather buy a used one from a member but seem to be having a hard time finding one for sale. Can anyone confirm that this is the pulley I need and does anyone know where I can find one for a decent price? Thanks!