I would order one from Chuck. Its going to be hard to find a replacement. It is big and you want to make sure you have the correct length and shoulder on it. Also, the washer is very thick and you may not be able to find it in the exact thickness.
However, if you really want to try, I have mine out right now and I can get all the measurements you need to look for a match. Let me know in a PM. I'll be working on it all day tomorrow.
id be sure to use a dodge part on it.
i assume its an ATI dampner ?
Crankshaft Damper Bolts:
part number 6036207AA size 0.75x16x2.250 (inches)
im sure its fine if DC sells it.
just go slow drilling the crank and its easy
Found the bolt locally at a nut/bolt place for 3 bucks and yes it is a grade 8 bolt...
Don't forget the grade 8 washer to go with it!