Hi James!
Thank you kindly for your review of the 21.25 in. Newport Side Splash in White. One thing we would like to advise, is that it is not that the sidesplash is manufactured by a 3rd party, but that Glacier Bay is actually a Home Depot brand that has more than one vendor, us being the manufactures of this particular sidesplash piece. Now, we can confirm that the sidesplashes are purposely designed to be universal (on both the left or right hand side) and we understand that this sidesplash may not match up with all Glacier Bay vanity tops but without knowing what Glacier Bay vanity top you own, we cannot be certain that the sidesplash manufactured by our team is the best match for your setup. Nevertheless, we hear you; we can assure you that your review and feedback have been noted (especially your suggestion about a left / right piece) as we are always looking for new and better ways to improve our products and customer's experience.
Best Regards.