Look at it this way, if my 2017 Ram needs a new quarter skin or door, I'd be real pi$$ed if I went into my local Dodge dealer to buy one & they said "sorry - we won't sell that to you." I can weld/install both.
Depending upon the manufacturer and the vehicle, you may end up having to go with used parts. Just keep in mind that if it happens, it's not the dealership saying they won't sell it to you...it's them telling you that the manufacturer won't let them sell it to you. Be pi$$ed, but direct it where it belongs.
