I have a large stash of kmc 415 industrial chains that are perfect for your build. Come with master link. Only $10 + $6.45 priority mail
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They are standard cruiser size and I believe they are either 110 or 112 link. I dont have one in front of me to measure at the moment where I am but next time I am in my warehouse I can measure the length.. I have sold several hundred to local motorized bike builders so I know they are long enough for standard cruiser projects