D6 8U Steering Clutch Assembly Plate & Nut

While tearing apart the steering clutch assembly on a D6 8U, I had to drill out one of the set screws in the large lock nut. I missed a few pieces and messed up the threads on the plate assembly (7B5190). I ended up having to use my hand grinder with a cutting blade to cut the nut off. Any good sources for a new/used plate assembly and nut (6B217). Are there any new part numbers that super-seed the old part numbers? 
Online I show a plate 8S5722, that resembles the plate (7B5190).

Thanks

Machinery trader.com shows both of these parts available.