Yes you must take the back wheels off to install! The flaps use the two existing wheel well holes where the "locking push pin thingies" are. You mount their metal clip in the existing tab then use their screws closest to the outermost part of the well then if you look towards the innermost part there is a hole in the fabric liner and that is where the third mount is!! Its super easy! And the directions they give you are straight forward! It took me 45min to do the whole car including taking one wheel off twice because i forgot to double up the washers! They are on rokblokz.com! the only thing is that when installed the back both angle up a bit, you can see it a little in the pic but its not really noticeable! Probably just a little more adjusting but I'm fine with them and everyone that loves the rally look it gives the car. Ill get a detailed install pics if you want when i get home but they are really not necessary because its that easy! BIG BONUS!! NO DRILLING!!
2013 Grey Hatch w/blk pkg -Gets me to places
1989 325i -Also gets me to places