Hi ...sorry for the delay in response. I'll post some pics soon.
String..The directions say to use masking tape to layout the molding on the side of the door. I couldn't get the tape to make a straight line. When I strung a line from the top of the front wheel to the top of rim back wheel (or visa versa..can't remember) it was easy to line up the molding. Double sided 3m tape is used. If you take your time, follow directions the install is very easy.