I've found that some diagrams in the AGCO Parts Book show the CB65 with boots, and others without. It's like they have old and new diagrams in the parts fiche.
I'm not sure if there is really any benefit to having the boots, but peace of mind knowing dirt, dust, and rain won't just fall in and pool on the linkages, valves, fasteners, etc. Some of my fasteners show some rusting in the caps where the water sits. I know I'm probably being neurotic and worrying about nothing. I just like to keep and maintain my equipment and vehicles with a high degree of care and I want them to last.
If a 3 dollar rubber boot can provide a couple more years of service life to me, ******, that's worth it.