Frustrating indeed and I don't have a solution other than send the part(s) back. Then you have to deal with the situation of which is better, a part that can be made to work or no replacement part at all. FWIW I prefer to use OEM parts when possible even when it cost more to do so.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.