It depends a lot on the plate you are using, for example some support PCB mounted stabs, this is the case for a lot korean boards. PCB mounted stabs are only from Cherry.
Other plates support plate mounted stabs in this case you have 2 types, Costar and Cherry, some plates can take both other not, depends on the cutout. You can not make a plate mount Cherry stab out of a PCB one.
Costar stabs can be bought from mechanicalkeyboards , Cherry are harder to find, I think mouser has them but you have to buy a lot of them. There was also a GB ran by Ivan.