Can I use a slimline letter-box to replace my existing standard letter-box?
No. The slimline letter-box was produced for a very narrow centre midrail frame. If you try to fit one into a standard size 12″ letter-box opening it will not cover the aperture (hole cut-out) through the door. They only come in a 12″ size and should only be used to replace the same narrow letter-box. Check the sizes before ordering.
