Here is my opinion about the dimensions in ST4 with 3 Belt per trac.
The dimensions are in Millimeters MM. Sorry Guys about the Inches.
As I know 1 Inch is 25,4 mm.ok
In my previous thread i make some mistakes about the holes in 2 belt per trac.
There are 3 holes per trac and 4 spaces between the holes.
So per side in 2 belt are 6 holes, the some number of holes has the 3 belt chematic, but diferent dimensions among the spaces and the frame
My trac is not in good condition, and the dimensions in millimetres between the screw probably would be wrong, so if someone has diferent opinion about the drawing Chematic in 3 belt, its better to add in the conversation.