There are 2 differant lengths you can get. Ones that go only to the body line rib, or ones that go full length. I put the short set on the 03 HEMI and they worked pretty well. I put the full length ones on my 04 CTD, and they SUCK!!! they don't fit very well at all. I really had troubles getting the right rear to match up, so I finnally took it to the accessories place where I bough them, and let them try to get it. They ended up opening another set and tried it, not much better, but made it work. I still have big gaps on all 4 at the body rib. I reccomend going the shorter version. I'm so discusted with them I'm going to take them off and put Flares on.
The 2 sets I have done included 2 differant ways of mounting. Screws or they had a little metal tab that hooks into the fender to hold them on. I tried both ways and the both seem to hold up just as well. Good luck!