They should just pop in unless the lever or clips on the plastic casing broke.
There is a lever that you can push with a screwdriver through the grill in the inner side to pop them out. Make sure the lever is in the released position and once pushed back in it should snap in.
I did the same thing, same animal, except I was near the triple digits and didn't hit it with the tire (thump thump thump). Mine cracked and the clip broke, I ended up using some velcro straps to hold them in until I got replacements.