In the parts manual for 68 it list part number 1857 780-1 for a 426, 440 engine. What is the bar diameter for these bars? It also list part number 1857 778-9 for a Charger. I presume a Charger with a 440 would require the 1857 780-1 bars? Now that I’ve cleaned up things a bit I see I have the 1857 778-9 bars in my Charger R/t with a 440.. Since my car was in an accident earlier in it’s life, I’m guessing that someone swapped out the bars as replacements for damaged ones?