Airtex 1436 appears to be discontinued. It's listed as "Not Available" on Summit's site, and is not listed at all on Airtex's site.
I have no additional information beyond being pointed to sales for a possible alternative. I can do that if you guys want, although it would be quite helpful to know what the cross reference is for it (or if it was selected based on measurements or something, and what the criteria is that decides if it will fit specifically).
Even then, I'm in the same boat as everyone else, so I can only pull strings if you guys get stuck somewhere.