Your logic is flawed. Simply because the pieces are notched to fit each other doesn't mean they must be used together to work properly.
I have trousers with belt loops and suspender buttons.
Does that mean I have to wear a belt and suspenders to keep my trousers up?
Again, even PS says they are all designed to work together... I researched them to possibly use...
I can give two sh@ts about their parts, and will be using others, for other reasons... I just get tired of seeing all the "if it ain't stock, OEM, verified good by me" attitudes on here.
Now I'll get off your lawn...