I've emailed oemvag to arrange a return and asked to exchange them for ones like yours.
Not sure how returns work? do they send a label or do i just post them back (their postage was £15)?
With the problem just being the wrong size, you'll have to pay postage (wouldn't think it would cost that much). If they sent the wrong ones out then yes they would pay postage, but in this case there side has no issue so you'd have to pay postage.