aligl item in combobox

I have this value in a combobox:

123 - aaaaaaa
1 - pppp
1254 - zzzzz
....

of course it is more professional:

123 - aaaaaaa
1 - pppp
1254 - zzzzz
...

or not?

possible that with code?

note:
- the max length of numeric value are 6 caharacter.
- My propertiy alignment of combobox if to the left.