Bolts but no nuts in engine bay

In the engine bay of my 2015 2.0 there are 3 bolts protruding from the bulkhead, behind the battery. They don't have any nuts on them. Is this normal? I was hoping that this might be the source of the rattle which I hear when driving on poor surfaces.
 
These?


2015-Mazda-Mazda6-Sedan-i-Sport-4dr-Sedan-Photo-3.jpg
 
No they are nothing. The car is available with different engines and transmissions and those studs (they are not bolts) hold various brackets and pipes not on your car.
 
Is that car one owner? I can't tell by the garbage picture, no point of reference although that does look like part of the battery in the foreground. It's possible those are studs for heatshields that attach to the fire wall, however due to the perspective it's hard to tell.
 
I believe it’s part of the mountings for the fuel filter on the diesel model. I can’t look now I’m running a Lexus.
 
I looked on my 2.0 but I can't aee them. I can't really see the firewall back there either.

I bet there is some reason for them being there. I wouldn't worry about them unless something isn't working right.
 
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