Replying to Fisheye front element replacement part

I scratched my fisheye while skiing and need to replace the front element. Have any of you guys done that before? Where can I buy one? It's a 72mm rebranded Opteka fisheye for my Panasonic HMC150. I bought it off vx1000market.com and they no longer exist. I thought maybe sending a message to Century Optics to see if they sell front elements? But my fisheye isn't a Century so will the front element fit on my fisheye?