Your are talking about the 14-ea000xx? I've been looking as well and this is the only one I saw: Matte Anti Glare Screen Protector for HP Spectre x360 14 inch - 14-ea0023dx Laptop By Artemis Shields [2 PACK]

There are no reviews and I haven't tried them yet. These are the plastic film and after putting one on a S10 phone, I'm quite impressed with the durability even though they are not glass.

There are a few other protectors, but the review consensus is that they don't fit.