Probably not, because the shape of the "foam" area is not circular. It is an oval. It's possible that a circular replacement pad would stretch enough to fit, but the shorter dimension of the oval is less than two inches, so it would need to be a smaller size. The current Amazon price is about $4 (list price about $7), so if the pads wear out, your best bet is to buy a new one.
I haven't replaced the pads yet, but that would be the right size, and yes, from past experience if the overall size is right, regardless of shape, you can get the pads to work....however, I agree with other reviewers in stating that at this price, you'd be better off replacing the whole headset.....especially since I'd believe by the time you need new pads, they'll probably need to be replaced, anyway.
I just measured them & they're actually oval, not circular. Approx dimensions are 2.25 x 1.75, so they're more than 2" at the longest dimension. You could try them, but more than likely, won't fit. Perhaps Panasonic sells some?
I agree with K. Watanabe on this one. I don't have the headphones in front of me, but 2 inches seems like a lot for these particular headphones and they actually might be too big for them. But then again, with the price at what they are, your best bet would probably be just buying a new pair of them to replace the old ones you have.
The 2 inch replacement foam pads DO FIT just fine. I buy them by the bag right here on Amazon for less than 2 dollars. I actually wash them over and over until they stretch out or become too flat, or I get lazy and just slip on new pair. Again, YES they DO FIT.