You need to select a single item? In case the Select Item activity works for that control, you can use an asterisk as a wildcard in the activity, like this:
id + " *"
where id would be your digits. Note: remember to use a space character before the wild card in case the number of digits is not the same for the id numbers, to avoid selecting wrong element.
Here is sample dropdown. I tried click activity And I pass variable in selector. but in text having some ascii or special character, due to that it is not select check box.
In this case you can use the id+ 4 to select the 4th box or you could click image on select all then use the tab hotkey to move down selected icon to the correct box then use enter to select it