Everything is included. The bolts are long enough to go thru and hold together firmly.
The standard is for round toilets.
Weight Capacity (lb.) 250 lbs
This does not fit the elongated toilet but there are some you can order. Just make sure it says elongated Also if you go to the Home Depot website and pull up the toilet you.have at the bottom they usually have accessories that will work with that type/model. If you aren't sure call or go to Home Depot and they will assist you.
Yes,very easily . I did it myself.
Yes. My brother no longer has that problem because the front of the unit is closed and gits snugly to the toilet.