Aluminium extrusion Profile V-Slot doubt [my own moducase]

[Vitruvius]

Hello guys! I'm making my own Moducase and I would like to use the same solution that Moducase uses for the front "door". They use some type of L profile that has a flat part where it sits the acrilic. Anyone has saw it for sale anywhere? It has any special name? i cannot find it. MAybe if it's not for sale i will use something like Modular displays for collectors do.

Thanks in advance!