hey did you just leave the bolts with that slack, not tightening them all the way up? I just put on my diffuser today and I have the exact same problem lol. The bracket does not come flush with the car. So I was just gonna leave it like this too, the bolts are there but not tightened down all the way because it would either probly break the bracket, or it would push out the top of the diffuser which is only held on by tape. But I tried tugging on it and it seems pretty solid even though those bolts aren’t tightened all the way. I am happy otherwise though; the tape seems to be sealed well without the diffuser popping out from the car leaving any gaps so I am happy with that.

Awesome thanks for the response! I will see about finding some of those spacers

Mine i used stainless custom bolts to keep the glass square angled thing nice and stiff