There is a special socket for the mounts. There are 3 steel tabs that the socket tries to grab then you can turn the mount. Using it sucks, so I just take a punch or screwdriver and hit on the tabs and it usually breaks the mounts loose for me.
channel locks work better. some are just threaded into the bulkhead, others have a nut under the bulkhead rail. when puting the new ones in, try not to grab the rubber with the pliers, keep them on the steel.
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