Hi.
I used a set of the Kirkey "L-shaped" mounting brackets ($50 from JEGS) and am using ERA sliders with them.
Trick is to orient the flange of the "L-shaped" mounting bracket away from the seat and then you should be able to mount the seat as close to the floor as you want it. I used a couple pieces of corregated cardboard to set the height before marking my hole locations in the sides of the seat. One thing I should mention here though - I was able to do this b/c I can fit in the 15" seat and the ERA floor was just wide enough. If you need to go wider on the seat, I'm not sure what your NAF will allow..
- Allen.