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Having trouble re installing the front facing camera assembly, I was told to buy the plastic holders for the camera and sensor, I am not sure where to put the sensor holder and I can’t seem to make it all fit without the actual assembly partially blocking off the slot where to earpiece clips in. Any ideas?

Your front camera plastic holder is not in the correct orientation. Rotate it 90°C clockwize and it will fit the front camera no problem. If you want you can check matching of the notches / indents of the front camera itself to the plastic gasket. Use this image for reference: https://d3nevzfk7ii3be.cloudfront.net/ig… The two indents should be top and bottom and not left and right to fit the camera.

try and follow the guide to see whats going wrong for you. iPhone 7 Front Camera and Sensor Cable Replacement