This template is meant to aid modders in better being able to get accurate anchors.
In the ZIP file is two bitmap files, with either a build or unit base, and green lines drawn. There are all different sizes, for whatever building/unit you wish, and in the ZIP is also a TXT file instructing use of the anchors. It is strongly recommended that you read it first, so you know how the file can best be used.
Essentially, you copy one of the selction boxes along with the green lines, and place them over your building. Whereever the green lines cross, should be the coordinates needed for your anchor.