Compatible Neutral Density (ND filters) for FPV camera

I am looking for ND/PL filter lenses to fit the camera on the PL2-F payload release camera for the FPV drone.  What make model of camera (DJI, etc) does this camera mimic?  The camera is 1.25" X 1.25" X 1.25" inches or 3.175 x3.175 x 3.175 cm.  Did SwellPro use the same type camera as another manufacturer?  If so, I can order a set of those type of filters to accommodate my needs to filter out light.