Is it the same Gullwing as in the pic below ? If so, just to clarify, the corners of the window frame are a different radius to the cutout in the body panel, so there is about a 10mm difference at the centre of the radius.
Also, when the original window is removed (late type, stuck in, no rivets) there is a small tab at each corner of the cutout. They are only small, about 10mm long and protrude approx 1-2mm into the cutout, so easy to overlook.
These must be removed, or the new window will not go in to the cutout without using excessive force. Even when they are removed it's a very neat fit, but the ones I've fitted have gone straight in.
I suspect they might not have removed the tabs. If the window came from Mulgo then maybe they just didn't read the instructions. By the sound of it, maybe they can't read at all :eek:
There are too many people out there who aren't skilled in the job they do, or just don't give a damn, unfortunately it looks like you've found one.
It would be good to see some pics if you can post some.
Cheers, Murray
https://www.aulro.com/afvb/images/im...14/04/1286.jpg