I had trouble finding a fitting case for my Gibson LP Junior. The neck angle on the LP Junior (between neck and body) is a bit different than on LP Standard. I'm not sure about the other LP models.
However, most LP cases are not a good fit for LP Junior, the headstock kind of sticks way too high when the guitar is put in its case, and the neck is not well supported. This is not a good thing for Gibsons with their fragile necks/headstocks...
But the Thomann ABS case is a good fit for my LP Junior, the neck is quite well supported. It's not perfect, but much better than my other LP case, in which the Junior neck would stick out too high, almost having to use a bit of pressure to be able to close the case. That's not a comforting feeling with a Gibson headstock!
I'm not sure if anyone makes a specific case for LP Junior, maybe someone does, but this one works quite well, I'm happy with it.
Oh, and it's pretty lightweight, too, and the construction quality seems good, especially for the price.