im not sure what the filler panel is but the full cover has a perfect hook on the top plus the two bends for the body line. guess u could use the machine or just save the trouble. i was happy with my purchase.
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Current owner of 2016 2500 Silverado Midnight Edition.
Former owner of:
69 1/2 ton, change from long/fleet to short/fleet, shaved door handles, shaved tailgate, 4/6 drop, power windows, 700r4
72 blazer, 350 with Holley Commander 950 DFI, crane energizer cam, 350 tranny, dual sanderson blockhuggers/magnaflow exhaust
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