If you’re missing the black metal frame part as well as the glass it makes it a little trickier, the metal piece ( I think it’s called an extrusion) is hard to find. I ended up getting mine from Marine Glass Specialties in FL. He has the OEM GW extrusions. He probably has done a Sailfish before and might not need a template. Not cheap, but I wanted it to look original.
They’re hard to get a hold of so have patience. I dealt with George originally , but he was out a few months back so I dealt with Tex.