The cheap, original, acrylic shower knob in my shower broke, and I’m looking for assistance replacing it. Attached are pictures of what the assembly looks like without the knob on it. I have been searching DIY videos but none of the handle assemblies look like this. They all look pretty standard, while mine looks wider and just different. I bought a universal diverter handle with a converter but I don’t see how it fits on this assembly. As you can see, the brand on the trim is Allen Co., which doesn’t seem to exist. Any help would be appreciated!!