On the picture with them sat next to each other you can see that the tapered part on the original rubber bush is about the same height as the tapered part on the solid mount. So because of that it is clear that the cap between upper and lower part of the solid mount won't be far apart, which is why I said it will probably only be about 2 mm or something. So it will definetely not making up the 2 cm that the solid mount is lower than the original bush.