i cut the original panel out and used two braces in the back to bolt the anvil piece to. i used the original holes in the bottom.
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1968 Camaro, LS1/T56,martz chassis,19x10/18x8 Budniks,245/45/18,295/35/19 {Sold}
http://www.fquick.com/patriot68
1971 Firebird - Speedtech Extreme Subframe/Torque Arm, LS3/4L80E, 19x12/18x10 Budniks