The fuel cap gasket broke on my VNL, so I stop at Legacy Volvo (Erie PA) to ge a new one. Not in stock, order a new one. Get it, try to install, too big to fit in cap. Maybe that one was mislabeled, we'll get another.
Same issue! New cap in stock, take a look at it, same size as mine, same size gasket, same part number as the one that's too big! WTF?