Hi,
There's not too much required to make them fit, mainly a little cutting of waste metal. On both runners drill out the rivets holding the angle bracket at the back and the spoons on the front then cut the seam weld at the side of the runner holding the remainder of the angle bracket on. Remove the angle brackets at the back and spoons at the front and depending on the size of the rivet holes enlarge them for the new mounting bolts or use bolts that will fit. To get a bit more height off the seat you should be able remove the cross bar tube under the seat base that keeps both runners in line.
cheers,
Mike