General OWB holster for a 1911 with an x300, anybody that says something like "doesn't work with Dan Wessons or Springfields," message them.
I don't know that any of that shit will apply with the giant light version.
To get the thing to tuck to the body a little more, if wanted, for concealability, put a wedge on the bottom of it, it'll tilt the grip into the body.
For the price, if whatever holster makers can't figure out with DW guns is present, just heat the thing up and move the kydex so it fits, put the gun in a plastic bag or two, heat it up and jam it in if you want the quick and retarded way.
Otherwise heat the specific area and use a knife handle, screwdriver handle, dowel, your finger in a glove, whatever, to move the kydex so your gun fits.
But the giant light likely takes care of things for you. I modify my shit so much I don't even think about stuff like this, especially because you aren't looking for anything special and don't care about extra retention methods. If your barrel is too long, cut the end cap of the holster off.
Shit doesn't need to be rocket surgery. Here's a cheap thing on sale, I have a very similar holster for my P320 with streamlight tlr 1 HL, it works...