Some of the filler is "Factory" as is the lead in other areas of the body. The import stations also did some bodywork & added filler to brand-new cars to fix damage from ship deckhands walking on the fenders... You'll likely find the decklid weatherstrip channel heavily filled by the gas tank spout- mine had filler nearly 1/2" thick in there! Hall's cheapest steel spreader bar works best IMHO, as all the pretty aluminum ones I've seen are so short the bolts still take all the load, just like the stocker. A couple of owners have added chunks of alloy on the ends of the aluminum spreaders in an attempt to make them work as well as the cheap steel one. If you do this, I suggest TIG-welding the filler pieces to the spreader bar so the assembly doesn't flex.
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