Well got the one by the front trap door. It and the bolt were all rusted. I had to use the stubby 16mm and then turn it until the wrench jammed on something so the bolt would come out ( it was too hard for me to hold the wrench with one hand while ratcheting with the other. And it turns out all of the bolts have nuts on them not just the two front. This is going to be so fun.

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2001 E53 X5 3.0 Auto. Silver Black Build date 10-17-2000 141kmiles

2004 E60 545i Sport 6MT. Black/Black Build Date 6-2004 102k miles