A handy person from California says:
September 20, 2016
I'm hoping you can help me identify this closer. It's in a commercial building, was trying to avoid drilling more holes
Dave from SWISCO responded:
September 23, 2016
We do carry the 79-254 closer, but I don't believe the holes will match yours, as you feared. Your closer looks like a "LCN" type. You might want to check with a local locksmith or glass shop to see if they can supply.