AirPod Pro 4 foam ear tips?

AirPods Pro 4? The latest Pro version of AirPods with replaceable tips is the AirPods Pro 3.

AirPods Pro 3 - Apple

There is an AirPods 4, but that is not the Pro version for replaceable tips.

AirPods 4 - Apple

For the AirPods Pro 3, there are companies such as Comply that offers Foam tips or you may want to look at Amazon for reviews and other choices.

• https://www.complyfoam.com/collections/apple?srsltid=AfmBOoqay8GoJk4_umN-m1Nwz2S_gEhHZLVhoR3j-nbLRd2GygS4PlUm

You're undoubtedly having trouble because there are no such things as AirPods Pro 4s.

There are AirPods Pro 3, and there are AirPods 4. They are two different things.