This is listed by the manufacturer as suitable for HP Specter but is 1/2 cm to wide. Not worth trying to get a real one that fits, so I won't be returning it. I just cut off the edge and called it done. Not entirely surprised as I have a similar 3M filter for my Surface and had to trim it to fit the dock as it didn't have proper cut outs for it. Hopefully they would do better, they fit the laptops they sell them for them, but it looks like they're just being very general and hoping for the best (or people doing what I did and trimming). The non-3M is significantly cheaper and may be a better buy since you'll still have to trim it to fit. 3M should be better at getting it right out of the gate.
π₯οΈ Optimized 3M Gold Privacy Filter: 13" MacBook Air (GFNAP002)
10 Review
Ovimir Diagonally Measured Computer Privacy Laptop Accessories
10 Review
Solitude Screens - Slimmest Magnetic Privacy Screen for MacBook Pro 16 inch - Dual-Sided Anti-Glare MacBook Pro 16 inch Screen Protector - Privacy Screen for MacBook Pro 16 inch Laptop Screen (2019+)
10 Review
π Enhanced Privacy with 3M Gold Privacy Filter for 23" Widescreen Monitor (GF230W9B)
10 Review