Razer Naga Trinity Mouse - 7 button thumb pad replacement?

Is it possible to purchase the circular thumb pad that is in the middle of the 7 button circular attachment? My mouse works perfectly fine, but as it is an older product, the rubber of the thumb pad had eventually just got ragged and fell off. I’d be more than happy to purchase a replacement, but I have no idea where I’d look or ask for that? If it even exists. I tried eBay but it’s only 3rd party items and I have no idea if it is even for what I need or if it is going to stick, etc. Any advice would be greatly appreciated!