quote; The upper bolts or if there is a hanger bracket, it is hidden from view. Any info is appreciated. Thanks.

The "carrier" in the wall is a conventional one. The upper bolt holes are there, but since the 3000 did not use them they are inside the wall and just need 5/8" threaded studs and nuts to create a 4 bolt pattern. The upper hanger bar for the 3000 is attached to the wall studs and has to be removed if you convert to a conventional wall hung toilet.