How to replace the rear camera glass?

The glass covering the camera strip on the back of my Pixel 7 pro has shattered and I need to replace it. I took it to a repair store who replaced the glass with an after market replacement but the camera is now unable to focus. They explained this is because Google uses a special optical glass, but I cannot find official parts. Does anyone have experience replacing the camera glass on a Pixel 7 pro successfully and if so what part is recommended?