i can't see the pics but if you are on about the torx headed olts in the centre supports, they are for the hieght adjustment of the bumper and don't actually bolt into anything else

what i will add though is that if you remove the headlights you can see (with x ray vision) these same bits of adjustment brackets that will be running through the chaissis legs and soem peole will drill through the chassis leg and into this support bracket and bolt them up to stop little toe rags from just simply unscrewing your front bumpers and having it away with just a 13mm spanner