Looking for Advice

[NSfarmer]

Hey guys, I really enjoy this Fortschritte 302 mower, but it seems that the cutting width is set up wrong so that it cuts wider than what the actual header is. Going to try to attach a screenshot. I've played around with this is GE before with no luck but maybe someone can turn me on to the right path of going about correcting what seems to be a very well made mod aside from this problem.

Any help is greatly appreciated!