Adequate but not perfect.
2002 Toyota Highlander
These adapters allowed me to mount both Rockford Fosgate component woofers and Kenwood 2-way 6.5" speakers into the front and rear doors. However the stock speakers had a mount that extended the speaker away from the door nearly double the distance, thus there is at least a 1" gap now between the front of the speaker and the door speaker grille.
Pros: It works. It fits.
Cons: Not as deep as the original mounts on stock speakers.