If you can use the sticky strips on the car roof's, or tacky dots? Are the white supports that come with ther led kits taller, or shorter than the ones inside the cars? I don't have these cars, but I do have the 2003 Rheingold/Helvetia sets with refractive lenzes, but these are not led's, but the smaller oval bulbs. I'm leaving them in.

I figured it out. First, I learned via measurement that all Schurzenwagens are not the same length. Mine were the Deutche Reichsbahn cars with the stylized eagle insignia that avoids showing the Hakenkreuz. The Mitropa cars are longer than the 1st/2nd/3rd class cars. Also, the posts are not in the way on all the passenger cars, just the 2/3 class cars. I also figured out that the posts were there to hold the old lighting in place. By moving the alignment of the LED lighting slightly off center, I can avoid the posts and install the Marklin lighting. If I use ESU LED lighting, there is no problem at all and its cheaper than the Marklin setup!