Some cheap replacement fobs are useless, I usually end up putting a screw straight through them to hold them together.
Others don't even accept the original blades, seller usually acts very surprised, I just lose the will to live.
Another bit of advice, never buy a blank of ebay expecting a local key cutter to cut them, they won't. Cheap key blades use hard metals which can shatter or wear their cutting blades.
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates