I went through the same problem of trying to figure out exactly what part numbers and products I needed. I also read the archives back to pre-history.

I finally went and found a sympathetic lab owner who only processes up to 120 roll film. I explained that I couldn't find a suitable place to have my 4x5 film done, and asked if he could help me get all the right stuff. He set me up
with all the right chemicals and some scribbled instructions for mixing them up. I combined his notes with the z131 publication and jumped in at the deep end.

My minilab friend uses and sells me Fuji/Hunt, but I also substitute the Kodak SM Tank products if I'm near my local camera store and they have them in stock.

Contrary to my expectations, I have found C-41 to be very easy. It must be almost idiot-proof!