Please refer to the following steps for installation
1: Before installation, please pry off the plastic tripod of the bottom shell (the plastic cover covered by the old rubber can be disassembled from the bottom shell)
There are several plastic welding points inside that can be flattened and pushed out with a screwdriver
2: The groove needs to be cleaned thoroughly
3: Simply stick it in place

Your question:

Question 1: My Laptop is also Latitude 7420 There is no Slot in the place where the Rubber Feet Strip is installed on my Laptop , but the newly purchased bumper pads on the bottom has raised areas that can be inserted. Is the Rubber Feet Strip bought the wrong one?

Answer 1: The Rubber Feet Strip is suitable for Latitude 7420 .You can't see the groove because you haven't cleaned up the Old bumper pads on the bottom. If you clean up the raised areas of the old rubber foot strip, you can see the slot and proceed with installation

Question 2: Is the The rubber foot strips I bought brand new?

Answer 2: Of course, our product is 100% Brand new and high quality, which is Product Are Tested Before Shipping. You can use it with confidence

Question 3: Is this rubber foot pad non slip and easy to fall off?

Answer 3: You can buy with confidence. Our Rubber Feet Strips are specially designed to prevent slipping and won't easily fall off, as we have undergone multiple tests.