yes it will fit... you can total use it...
Anything can be done with a welder, but the bolts do not lineup.
There are 4 listed in the Toyota Handbook, all for 'theft deterrent system' in main fuse box (large lid in centre of dash). First try 2nd row up, 5th from left (Dome fuse). Also 2nd row up, 2nd from right. Also bottom row, 2nd from right. Lastly, 2nd from top on right hand side.
Do you want to REMOVE it entirely from the vehicle, or are you asking how to lay it down flat in order to make a longer rear deck floor?
You can either slide the third row seats forward with the adjuster bar under the seat or fold and flip the seats forward so that they rest against the 2nd row
On a 2003 Ford Expedition : The 2nd row seating would be a bench seat
In my dodge 99 the 3rd row seat can go in the middle row.
seat belts have a unlimited warranty. the belt gets twisted and they replace for free!
Any seat could work with safe installation...welding is the most solid way to add seating. You can purchase extra seating online. One site I know of is www.littlepassengerseats.com
in the fuse box middle row closest to seat 10amp
In the floor behind a flap between the drivers seat and the first row of seats
You can find the third row seat in your Dodge Durango behind the second row seat. The Dodge Durango third row seat is usually the last row of seats in the vehicle.
Under the passenger middle row seat in a bag - probably under the jack.