I misunderstood your previous post and thought you'd decided against the DUO modification.
I think one needs one pattern for every two existing patterns. I have 7 patterns so theoretically need 3.5 patterns. However there's a sizeable end gap filled with two regular chains. The additional DUO patterns will move the side chains a bit higher on the tread, so there should be room for the 4th pattern. But it may require some non-standard modification. My biggest problem is a mere 1.5" inside clearance to the fender support--there's little room for extra hardware to make the inside connection.
From the Laclede catalogue it looks like your Deere 5083E's 16.9 x 30 AG's use a DUO271 chain with 10 patterns of DUO298(17 links, 31.55" long). If so, that would require 4.5 patterns per side? An idea may be to stick with the 4 per side and order others if required.
My supplier builds DUO chains from drums of bulk DUO patterns. My DUO's have 13 link, 25" crosschain patterns. They are the second set. He misjudged the first, building them with 15-link crosschains. The links joining each pattern's crosschains barely fit on the tread, and the inter-pattern gaps were much larger than the area covered with chain. Here's a photo:
He replaced those with my present 13-link chains. They are OK, but 12 links would have been better. The mistake is understandable. My supplier is in Prince George and I imagine most chains he makes are for large forestry, mining, and oilfield equipment.
Even CandianChains.ca(who use Quality Chain products) seems confused with 43x16-20 tires. Last year they switched from DUO239 with 7 patterns of 12-link crosschains to DUO242 with 9 patterns of 11-link crosschain(which did not agree with their new catalogue). This year they are back to DUO239 BUT using 10-link crosschains(DUO293). Ten links seems short, so I wonder if that is another error. Laclede on the other hand doesn't even specify a chain for 43x16-20's. TireChains.com no longer shows DUO's for my tires, but I think they did last year.
It's been interesting and I'm actually looking forward to messing with the chains. I'm sure the end result will be good. But if I were starting from scratch I would likely forgo the DUO's and use something similar to Gordon Gould's chains(post #2 in this thread).