Door pockets for the Mazda Bongo always break around the lip (well...this is a 20yr old car!). I built this model in Fusion 360 to replace them.

To fit, remove the panel screw beneath the cap on the outer most edge of the door panel. Unscrew the original door pocket and remove.
Pop the outer edge of the panel loose from the panel clips to get your hand inbetween. Push the new door pocket into position, angled so you get the outer triangular nodule in situe first, then push and squeeze the pocket to get the inner nodule in and the pocket flush.

Check the metal bracket in the door itself is in the right position to accept the retaining screw (it may need bending up) then fiddle around to get the new pocket screwed into the bracket. Job done..happy days..