Very simple process. I prefer these pads over the others I have tried including the originals.
Here are Amazon links to the pads and the headphones.
Wicked Cushions - https://amzn.to/3GPxCeu
Sony MDR 7506 - https://amzn.to/3HdJGra
Disclosure, these are paid affiliate links. A small commission could be paid. No price increase to you.