As everyone mentioned the repro ramp is a very tight fit, but I'm happy to report it is possible without playfield modifications (no routing of the playfield!). My tight spots were as follows:

1. Ramp entrances. As the ramp is very thick, there is plenty of room to grind an angle in the plastic under the ramp flaps enough to sit flat on the playfield without sacrificing ramp stabiliy.

2. Pop bumper. I used a Dremel to cut the ramp to fit around the pop bumper, like the original. There is almost no risk to doing this, should have come better cut from the factory.

3. Spinner entrance. I used a Dremel to grind a bigger entrance to get the ramp to fit over the spinner assembly. Lots of trial and error, but not difficult.

4. I had to replace a star post at the left ramp entrance with a thin post to get the ramp to fit there... The playfield holes were all placed correctly and no good way to drill new holes, but just another side effect of the thicker ramp.

Other than that it basically much fit in the old positions with a little forceful bending in a couple spots, so I'm really happy the only mods required were on the ramp itself.

You could use the original yellow rubber on the posts which are wider and would deflect more shots away from the edge.