Any how to's for doing this?
I may be wrong, but, I think it's a direct swap.
The old style catcher has a bar that attaches to the sweep. new style attaches to legs.
There a many mods that have been done to accomplish this task. Search the forums for convert OTS to OTG. You can use hose clamps, bailing wire, or make your own solution with rivets.
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@jacko1962 - Here is the information you need. Although it is for converting (adding a ash bucket) from a OTS to a OTG, the instructios still apply to what your asking.
http://weberkettleclub.com/blog/2014/03/03/converting-a-weber-ots-to-otg/