Well, I have never removed a door card from a Ch.126 car. Only ever 108/109 and those are totally different in the way they are attached to the inner door skin when compared with the W116 models. On the 126s, you have four square shaped types of hooks on the top section, and the door card itself further down has two hooks, one front and one back, that slide into apertures that are cut into the inner door skin. Once those "hooks" break, you can secure the door card by means of chromed dome self tappers to the inner skin. I am not certain if 126 items are the same, but that's how 116 cards are fitted. Hope some others may be of help to you. BTW, nice to have you on board. Regards Styria
N.B. I suspect that Oversize will be able to assist.