Based on all the other Slope Brick Curved, I think it should be:
Slope Brick Curved 3 x 2 x 0.667 with Fin and 2 Studs
The order of the dimensions in Slope Bricks Curved are usually Z x X x Y
Slope Brick Curved 3 x 2 x 0.667 with Fin and 2 Studs
The order of the dimensions in Slope Bricks Curved are usually Z x X x Y