Sliding Door Wall Magnets

[Surebet <surebet@xxxxxxxxxxx>]

I've read many of the FAQ's here and reviewed many of the switches
available, but believe most of the ones listed as steel door contacts
are for larger, commercial steel type doors or perhaps steel front
doors on homes, etc.

My home was prewired and contacts were installed on the sliding door
wall doors going out to the back porch, however, when no magnetic
contacts were installed in the doors.

Being that the inside of the doors is not solid and mainly hollow
before you get to the glass is it still not appropriate to use the
magnet that comes with standard recessed door contacts?

The reason I ask is because I have looked at some of the steel contact
magnets out there and they appear to be quite long and I am not sure
they would fit inside the door wall frame, but the standard recessed
magnets will.

So, if I cannot use standard recessed magnets in the door can anyone
recommend one that might work in thinner door wall type sliding doors
typically found in residences going out to a back porch?

Thanks.