Harmonic balancer help

Hey guys, I dont post much, but now I need some advice. I think my harmonic balancer has slipped and need to know what my best option is. It's a late 72 340 with cast crank and externally balanced motor. Not a real easy part to find! Is there another balancer I could use such as a 360 ext. balanced one or maybe an aftermarket one that wont break the bank? Thanks for the help.
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