Am dealing with a similar issue with trying to locate a set of pins for a PSA PX-10 build I have been working on. Have spoke to several mfg's, made orders only to find that they are all either to big, to short, or to long. PSA has not helped, and now they have discontinued the PX-10 in their .308 AR 10 lineup, so nothing from them. I have micro'd out both pin holes and lengths straight off the Lower, and have tried shopping using spec's. That has proved to be just as useless.
My last option is to use a set of the longer and wider replacement pin sets I have received, and find a local machine shop. My hope is that I can give them the specs i need, and have them lathe cut the ones I give them down to size to fit my PX 10.
Once I know they fit, I will ask for 2 more sets (just in case), and then have them all Cerakoted, and that should do the trick. This AR 10 .308 build has been a real pain in the butt. It has also been one heck of learning experience as a novice coming into this.