The iPhone 7 Plus was a previous generation model, and various screen protectors were available from different manufacturers. Apple itself also offered official screen protectors or recommended third-party options on their website and stores.

To find the original or premium screen protector for the iPhone 7 Plus, you can visit the official Apple website or authorized Apple retailers. They should have a selection of certified accessories, including screen protectors, that are specifically designed for the iPhone 7 Plus.

When choosing a screen protector, consider the following factors:

1. Material: Look for high-quality materials such as tempered glass or military-grade film for optimal protection.

2. Compatibility: Ensure that the screen protector is designed specifically for the iPhone 7 Plus to fit its display dimensions and features accurately.

3. Reviews: Check customer reviews and ratings to see what other users think about the product's quality and ease of installation.

4. Installation: Some screen protectors can be tricky to apply correctly, so you may want to look for ones that come with installation tools or have a straightforward application process.

5. Warranty: Check if the screen protector comes with a warranty against defects or premature damage.

Remember that my information might be outdated, so I recommend visiting the Apple website or reaching out to an authorized retailer to find the most up-to-date and suitable options for your iPhone 7 Plus.