If you have the tools and safety equipment you can install a can yourself.
Otherwise have a local contractor do the work for you.
Using an angle grinder, cut two 2" vertical slots in old liner inside of hinge brackets as shown.Now cut out the piece between the two slots.
Place two bolts or one long bolt thru the old hinge holes and the new liner hinge holes as shown.
Add pea gravel to fill in void up to bottom cross member at the bottom on the liner This will provide drainage for any water that might seep into the new liner.
Fill the gap in between the old and new liner with play sand
Complete by using spray foam like Great Stuff to finish off filling the gap.
You are done!