Just got the lens cap/gimbal lock from Polar Pro for the Standard. The other from PP only fits the Pro and Advanced. Polar Pro was great to work with - I sent them a photo of why the one I bought from B&H did not fit the P3S (which B&H mistakenly stated it would fit all 3). Polar Pro manufactured the new one (3D printing?) and within 2 weeks I have a cap/lock that works beautifully! Both companies were very good to work with, but a major kudos to Dan from Polar Pro. Great customer service is a beautiful thing.