Think standard is 16"? I had scott make me one 4" longer than stardard with all 4 inches added to one side that way they don't overlap between the two holders. I have 5 holders on each mounted at front for capacity of 10. Kinda wished I'd asked for 6" extra. Gets a little crowded when spreading them on the butt end of the rods. I'm sure he'd make you what ever length you decide


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