changed my defective seagate 3tb from 2014 to Seagate ironwolf 4tb, à slight trimming of the top piece was necessary.
to pop the bottom i was pretty successful using a guitar pick, and removing cable was quite easy with a small twizzer, carefull being close enough to the connectors and don’t force on the cable themselves.
taking out the harddrive was tricky, balance it left to righ and pick the box horizontally helped getting the drive out 2cm to get a grip and remove the whole drive.
If you use a seagate leave the Bottom left and right rubber in place and apply a bit of force to make sure the drive is in and doesn’t stick out.
to reapply the top rubber start with the left side , the right side has more space and it’s easier this way.
to reconnect the cable use a spurger to press the cables back into place .
having a strong light source like a headlamp will be helpful for this !, did it with my maglight in my mouth . You need 2 hands , one for the twizzer positioning the cable the other for the spurger to push.