Are you sure about that, I just installed one and still they don't come with them even after I called them and complained, this is the second time someone from Square D acted surprised when I told them they include them when you get a panel with a main breaker (which is when you don't need one) and even have them already installed, but with a main lug they don't:rant:
As far as that panel, I have said before Square D panels are not listed to remove or alter the jumper bar, someone posted a link to this on Square D's site once.
also those red bushings are not listed for NM cable much less then for the SER cable as it does not secure the cable to the enclosure, even if it was how many NM would you be allowed to put in one?
Is it safe, well not sure about the red bushings if they will prevent the cable from shorting on the KO opening but at least the bar he used for EGC's was bonded to the box, I have found these where the whole bar was removed and the box had no bonding and had conduit run to it, it was caught because there was no grounding path on any receptacle in the garage it was installed in. one of our guys got a good chewing for that one.