Chances are is that the lower bolt is hidden out of sight by the bumper which would need removing in order to gain access to it, not clever! but i don't ever recall seeing anyone having to remove the bumper to change a bulb (not even on c5's which are awkward), generally a bit of cursing is involved but I'm pretty sure they're accessible with out removing the headlight (a small mirror & a torch will help see into the back of the headlight unit).
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