Yes installing this with cable ties is an option, however this post box does not have a rear access facility. For installation to vertical railings I can recommend the Black Railings Post Box.

Although we are unable to provide additional keys for your post, We are able to provide a new lock which will come with 2 keys. Genuine Replacement Brabantia Post Box Lock

The external width of the opening flap is 301mm.

This would be classed as an anthracite grey post box in the Decayeux range. (RAL7016)

This unit only has one letter flap which moves inwards. You could have a look at our Brabantia - B410 Dark Grey Post Box which is fitted with protective slats to prevent mail from being stolen or you could also consider the Bobi - Classic Grey Letter Box which has the option to have a security baffle fitted.

Providing the box can fit flush to the fence and there is sufficient thickness of material for the fixings this should be possible.

These boxes are constructed from a high quality pre-coated steel that is suitable for outdoor use including coastal areas. In your circumstances we would often mention Brabantia as being the best choice.

Providing the post box can be affixed flush to the wall and the fixings can anchor into a solid substance this should be possible.

The post box does correspond to RAL 7016.

The letter slot is 270mm wide and 35mm high. Most magazines should fit.

As standard the post boxes are fitted with a Cam lock operated by keys, there are no combination locks available as an optional upgrade from the manufacturer. You could potentially try to customise the unit with this type of lock but you would need to be sure that the combination lock used is weather resistant.

The internal measurements of this post box are 408 x 308 x 150mm (HxWxD).

Yes this dark grey post box is colour number - RAL7015.