Are there any universal pcb that would fit this left corner usb pcb?
What do you mean? I am totally lost here...
I was just wondering if there are any universal pcbs like h87a that fit certain tkl keyboards.
em... H87a is probably the most "universal" TKL pcb there is right now.
H87a page links to a compatibility chart and mentions boards that aren't compatible (it won't work with commercial TKL boards).
That said - I have no idea if H87a PCB will work (more like fit) with C
3 boards. It probably doesn't really matter as LDN series PCB has USB-C, RGB lighting and is fully programmable. Even googled a bit (c'mon guys, do a bit of research before asking questions) and it looks like LDN TKL pcbs
support all the usual layouts (WK/WKL/ISO/split backspace).