Razer Naga Trinity Mouse - 7 button thumb pad replacement?

is it possible to get a replacement for the circular 7 insert for the Naga Trinity mouse? i love the mouse but i cant seem to find any available for purchase and i honeslty make full use of the 7 wheel and i dont like the newer naga trinity 2 6 12 as i prefer the 7. if the 7 is available to replace awesome, even better if i can get a “newer” naga trinity. if i need to i suppose i will look to other brands but i want to stay with razer as i like the products.