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I don't think I'm going to be able to help you Neil, the machine they came off of was a j series. It has 4 roller frames and 31 links. Seems like I've read the construction idler required one more link so you would be at 33 with the five roller frame. However my 5j parts book calls for 35 links for the 5 roller frame. Hopefully someone will have more specific information
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