I can never understand peoples thoughts on penetrating oils/fluids. Certainly if there is a thread to apply it to then you are in with a chance. In the case of the carrier bolts, the threads are non accessible and the hex head of the bolt is tight up against the carrier to the extent of creating a seal so the fluid goes no where except running off.
If you are really struggling with these carrier bolts because someone before you has not fitted the hex key in correctly or used the wrong size and mangled the head, then a small pair of stilsons can be used to grip the outside of the head and extra leverage with a pipe or similar will get them started.
I am sure I will get bombarded with people disagreeing but hey, that's what makes this forum so healthy.
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