The first thing you should do... Jack up your car, take off your wheel.
Find a heat gun and a mallet/hammer, cover the tub edge with layers of tape.
Then heat the sucker up, tape should protect paint, then slowly roll the edges
in using the hammer, while keeping the edge hot enough to fold.
I had problems like that on my old car but in the back, the lip of the tub shreaded
the walls of my tyres, but was all good after doing that..
**unless i read your post wrong and you actually mean the tub itself but then i
figured the tyre would be hitting the suspension housing..?