I made the numbers 0 till 9 so you can make allmost every house number you can think of.

Print the letters or numbers you need in a material that withstands the weather.
I guess anything but PLA... (or sand and spray paint your PLA).
Layer height 0,25mm and for the pins 0,15.
Make 2 pins per number. (or 3 for a letter)
Number height is 107mm - 15mm thick - font is Arial Bold

You have to use a mini hacksaw to make a kerf of about 5mm deep in the little tubes on the numbers.
One kerf is enough. I could have designed it but I think sawing works better than printing in
this case. This way the pin fits exactly in the tube. Push or pull straight in or out otherwise
you'll probably break it.
You can use screws with sunken head of 4 x 39mm. (head is 7,8mm diameter)
Assemble the screws for silhouetting the drill holes.