12/24 + 12 full size, or 24 1/2 size. Same for 20/30, 8/16, 30/36, 30/42
If not marked in that way it would be marked with how many spaces or (30/30 all full size), as would be any panel that half size aren't made for like bolt ons. i.e. a 24, 30 or a 42.
I heard that in Canada you can get 84?
