These upgraded end plates fit the Fulcrum wing. If you have the older style small end plates, increase downforce with this great upgrade. The effects of an end plate may be calculated with the formula suggested by Hoerner (Ref 2.21, p. 3.9). According to this model, the end plate increases the effective wing aspect ratio (AR) by the ratio:
Where "h" is the height of the end plate and "b" is the span of the wing.
End plate CFD (right click to enlarge):