but i want to create a select list that only has {a, d, f} with indexes 0, 3, 5

That condition doesn't appear in your program anywhere.

You could for example define a hash with the keys a, d and f, and only call $m->out if $_->{label} exists in that hash.

And by the way, if you scream at us in your title and append four exclamation marks the topic doesn't become more important for us - your chances for getting help would be much higher if you'd actually chose a title that describe what you want help with.