Recently bought a 48" BB2048 Frontier box scraper. I have the lower arms for the 3 point but not the top link. As I measure it out the distance from the top link hole to hole is 25 inches. That seems really long to me could that be right?
As you know the top link needs to adjust both shorter and longer than your bottom arms so you can tilt the box blade up and down. This one adjusts from 19 to 25 inches.
Your lower arms seem long to me if they are 25 inches out. Perhaps show us how you are measuring?
I can measure mine in the morning and post photos if you want. Not sure the 6100 dimensions are the same although some else likely does.