Here's what I did when replacing the rockers on my 74 chevy pickup. Remove seats, doors, carpets etc. to clear the way. Match up the new and old rockers to determine where you need to make the cut. It may not be necessary on all cars, but I made a brace between the front and rear door jambs in order to maintain the proper door opening. Remember, you're cutting away a main structural member. In order to avoid overlapping the new metal with the old, I made my cuts to provide for a butt weld at the joint. Using flat pieces of sheet metal, I used pop rivets to fasten the new rockers in place being sure to rivet all planes for rigidity. After welding the rockers in, I punched out the rivets and welded the rivet holes closed. Ad paint. Salt and pepper to taste!
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