Help attaching wall mounted letter box to fence railings without permanently damaging the fence

[docjill]

Hi, I'm an absolute novice DIYer and need some ideas and help. Need advice on potential solutions people might have, but also all the relevant bits I should get to make this work - both tools I'd need and anything specific with the various pieces I should do/know to buy. 

I need to attach a wall mounted letter box to a rail fence without causing permanent change to the fence as not sure that this is the final solution I want for a letter box but need something ASAP as Australia post won't deliver without a letter box of some kind and house has nothing. 

I'd thought perhaps I could go a very simple solution like https://www.amazon.com.au/Mounting-Mailbox-Letterbox-Attachment-Postbox/dp/B0CZSTXDKD?th=1 but can't seem to find something similar at Bunnings (but could be just that I can't think of the right name to call it here). So if someone knows what to search for I'd appreciate it. But also this type of bracket isn't going to work as a straight forward option as the 4 holes in the letter box don't line up with my fence rail gaps - 1 set lies where a rail it. I'd also like the rails protected from this kind of thing so they don't get their coating scratched. Also the letter box needs to not be directly flush to the fence or the top can't open. 

Whilst it seems the easier option to just drill additional holes in the letter box to match my rail spacing - am a bit worried that if I drill new holes that it will become vulnerable to rust. I'm in a coastal area but not right on the beach but things do tend to rust. 

So instead am wondering about a design like pictured with 2 bits of wood on either side of the fence bolted together and then attach the letter box at the front to the wood.  I appreciate the wood would need cutting to size and then be stained or oiled to protect from the weather. But not sure if this is the  best option or exactly what I will need to buy to make this possible (and hopefully not have it look like a 10 yo's woodwork disaster). Although also happy to do something quick and easy that would be hidden behind the letter box and last long enough to perhaps do something a bit nice later on when my DIY skills have improved. I have very limited tools and no power tools so absolutely will need to borrow/buy somethings for this but not 100% sure what to get. First time home owner so suddenly have to start accumulating kit and skills to do all the maintenance around the house so ideally like things that will be useful in the future - not just for a single job now. 

Any advice or thoughts very welcome. Thanks  

Thanks.Back of the letter boxNot sure why this is uploading sidewaysAlso uploading sideways and I can't seem to fix this sorry

[AlanM52]

Hi @docjill,

I suggest you drill another set of holes in the letter box.

With the top holes aligned mark and drill another set of holes so they clear the bottom of the rail.

Cheers