It'll depend on the design on the headphone. In my experience the sound/tuning of the headphone is tied to the OEM pads. So while you'll very likely have many options available to you for those headphones, they my differ from the original pads. You can improve comfort, you can add bass, or treble, or transparency with pad swaps but you may sufficiently change the sound to the point it's just not desirable. The worst part is you really won't know till you try but a cursory glance at what's available for the 7506 means you have some cheap/quality 3rd party options.
That shit always happens! I've gone through like 3 pairs of those headphones.