Brake booster check valve for LS swap

[Scotts Elle]

I was wondering if anyone had a part number for a booster check valve with a 1/2" barbed port. The issue is that the LS I dropped in has a 1/2 vacuum port but my booster has a 3/8 port. Most part numbers that I am finding are the 3/8" port. I have been to multiple NAPAs, Autozones and Advance Auto Parts and those guys are frustrating... There are over 30 part numbers for booster fittings and they don't carry any of them and have no idea on what size they are (I get the typical, "I can order it from the warehouse" response). I can't find any cross reference to the parts numbers either. Some look like the port is the right size but there is no specs published on it. Please help.