To check the fit of the stock spoiler vs. the Euro spoiler, I removed the stock spoiler, and made a cardboard template of the bottom edge of the front bumper. As can be expected, the template of the bumper's bottom edge matches the stock spoiler's top edge almost exactly.

 This photo shows top view of the template laying atop the driver's side piece of the stock spoiler; the Euro spoiler is below & to the right. (The center front of the spoiler pieces are at the left.)

Here is the template atop the Euro spoiler. The curvature of the Euro spoiler's corner is shallower than that of the stock spoiler. As a result, the rear (trailing) edge of the Euro spoiler sticks out about 2-3".

In order to make the Euro spoiler fit correctly, you have to "notch" the inner corner of the spoiler i.e. cut wedges out. (See the thin red zigzagging line.) Doing so will allow the corner to bend more sharply without putting any strain on other parts of the spoiler. The mounting tab at the corner will be sacrificed, but the surrounding tabs are more than enough to keep the spoiler anchored firmly in place.

(The blue portions are what I had hacked off in a previous attempt to fit the Euro spoiler, before I figured out the corner notching trick. You do not need to do this kind of hacking to get the Euro spoiler to fit.)

One issue with cutting the notches as in the photo at above left, is that as the spoiler gets older, plastic fatigue will cause the spoiler to tear/crack at the point of the notch, where the cut lines intersect.

To avoid having intersecting cut lines (and hence the eventual tearing/cracking) is to make a round hole at the apex of the notch then cutting to it, as in the photo at below left. A small drill bit, or a red-hot nail, will do the job.

You will also need to trim about 1/4" - 3/8" off of the front edge of the lower bumper's lip, to allow the spoiler to sit closer to the bumper. The trimming will allow the tabs to snap in more securely, as well as allow the side tabs to be seated further back.

An illustration of the profile of the Euro spoiler (left) versus that of the stock spoiler (right). As you can see, the Euro spoiler is a. deeper, and b. less "raked" back, both of which cause the Euro spoiler to appear much deeper than the stock spoiler, even though the Euro spoiler is deeper by only about 1 1/2".