The positioning is good, but that reticle has a circular mask, and the reflector glass in the Lysander cockpit is square. You might prefer to use this one instead.

<Effect Type="Track" EffectName="UK_RAF_ETO_gunsight" PosX="0.000" PosZ="1.075" PosY="1.058" Pitch="90.5" MinVel="-999999" MaxVel="999999"/>

The pitch has also been adjusted slightly to align the gun convergence point with the center of the sight.