I'm sorry mate, a few others have asked me about this but although I have a spare left hand footrest for the later version to mine I'm not really up for making any for others right now as I'm too busy to make it worth my while.
If my time frees up in due course and I can do something cost effective then I'll let you know. But if you follow the steps I gave you would not find it too difficult to make your own (remember, I was a complete novice when I turned my hand to this).
Sorry, but good luck if you decide to go ahead.