That would be ideal, but can't say I've ever seen them either. However, and you may have already thought of or done this...I have put 2 or 3 "in series" so to speak just like a nylon wire tie, adding their lengths to achieve the desired total length / circumference; three 4-1/2 inchers add up to almost a 12 incher when the worm gears are engaged enough. It would be pricier than a single 12" but could keep you from having to stop, go get longer clamps, return, set up the bucket truck again, etc. Then those 'pricey' clamps become cheap!