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Thanks Larry,

Yes, I am trying to get to the bottom of this.

Did you see the part numbers listed in the article? They are different part numbers for the 18', 22', and 25' so this should tell us that they are different. The only thing different should be the length.

Do you have any part numbers on your original invoice for the side rails when you bought your 18' ?

You also have the Mills Canvas set on your 18', don't you?
Do your rails interfere with the Mills cleats and footman loop?