hi my 52 Super 88 has one if these brake lights which tell you if the handbrake is still pulled when ignition is on.
now i got a problem with mounting this light back in the dash...
i just changed the bulb and now it wonīt fir anymore...

 

what is wrong where it does not seem to fit?

 

One is presuming you replaced the bulb with one of the same size/dimensions so as not to alter lining up of parts? I only ask as, if not that could cause fitment problems. Does the bulb have asymmetrical tangs? If so, I would think the bulb could only go into the socket 1-way. Can't hurt to try and put it in opposite from the way it is installed now, if you can, and see what happens.

Does the warning light housing just snap/press fit into the dash opening? Does the bulb socket just snap/press fit onto the light housing?

 

I think there is no problem with the bilb.

It is like there is a clamp/spring between the dash and the socket missing.
I searched the whole car but I didnīt find anything and I canīt remember if there was anything like a clamp/spring
Now if you try to mount the light back in the dash it wigles around and you can pull it about an inch out of the dash till the socket stops on the inside of the dash...

I can take some more pictures this afternoon.

 

From your description it does sound as though a part/spacer/clamp or something is missing. Perhaps a good vacuuming will find it. Hopefully, someone familiar with your car will jump in and assist.

Do you have a factory parts manual? I ask, as it may have a blowup of the light hardware from which you tell at what the missing part looks like.