Do not use stock interiors

So they want to check that it’s the right wind lace before they refund the money? What the heck is the problem with that? How do they know you didn’t screw up the install?

Sorry, but I really don’t see the issue. They’re probably just trying to confirm they actually sent you the wrong part.

Now, if they determine they sent you the wrong part and still don’t refund the money, then you can be upset.

As for paying shipping, what does their return policy say? If it says buyer pays return shipping then you’re getting the service you agreed to.