Facing the front here are the measurements on mine with a ZDZ40 in it. Top left is 33mm, bottom left is 31mm, top right is 38mm and bottom right is36mm. The engine mount plate (extended firewall) is 133mm wide by 100mm high. Hope this is of some help and sorry about the metric but that is how most of these arfs are made. My calculations from these measurements are 2.1 degrees of right and 1.1 degree of down thrust.