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Once you have it in place where you want it, drill up from the mounting tab through the crossmembers and temporarily attach the flanges with nuts and bolts. Put the bolts in from the top and the nuts on from the bottom. I welded the heads of the bolts to the crossmember to make tightening the nuts easier and because once the bed was on, I won't be able to reach the heads when I want to remove the tank. All that was left to do now was to re-install the bed and then locate and cut the hole for the filler neck.