Some Argos ones you can get, that one there’s no info on anywhere so you will struggle, if there was even ever any parts at all for it as a number of them, there doesn’t seem to be.
Fridge plastics are moulded specifically to fit the cabinet or door and do so to within a fraction of a millimetre, they have to absolutely bang on or they won’t fit at all.
So for door shelves, if wrong they’ll not fit or fall off. Drawers and shelves inside the same or they won’t sit correctly where they should do.
From sizes, you cannot see this as they’re all much the same size cabinet wise and internally you can find scores about the same but that’s not to say that they would fit or fit correctly as the mouldings can vary wildly.
K.