Holy mother of God this is impossible!
I've managed to remove the carrier but now I'm trying to put the new one in. I've got it in, however I cannot get it to align properly with the handle or the smaller part (triangular shape) handle. The carrier will just NOT align flush with the inside of the door. Either the front part (where the black notch of the handle twists into the carrier) aligns but then the back part of the handle will not align. I am going nuts. I've tried the old carrier and it won't align either. I'm at my wits end!