You should be able to replace them without removing the tank. Do one at a time, and support the tank so it doesn't move when you remove the strap.
Let me know if you have other questions. Also, spray down the retaining bolts with a penetrating oil several times before trying to remove them. Chances are they are rusted and you don't want them to break.
Joe
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Saturday, December 5th, 2009 AT 9:05 PM