here are the three feet
the old style, the one that came with the conversion kit, and the newer Sure Foot. HQ may be putting the newer foot in the conversion kit - but I didn't see that. The open toe that comes with the kit is the same height as the older ruler foot.
I used that one for several years, and only had a bit of problems ending up on top of the ruler a time or two. With the new one, that has not happened and I don't have to be near as careful on how I am holding the ruler.