From what I gather, ours is the same as the old TC XB and probably a bunch of other Toyotas. Went to Trd spark and check their accessories and they had a knob their with the info m12 x 1.25
You can check eBay or Microimage or whatever you like. Here's a link to ebay to see what's available.
http://shop.mobileweb.ebay.com/searc...0&isNewKw=true