Auto Part Store Questions

I had a guy in the store here saturday, looking for a p/s rack for his 50 Chevy pickup with 70's Cordoba front suspension. He left the old unit with me for a few hours so I could puzzle over it. Took some searching, but I figured it out. Turned out to be a TRW rack from a mid 80's K-car.
Now, had he come in with a big attitude and no info, I probably would have just sent him down the road. I'm more than happy to help someone if they're willing to work with me.