Dado Set

I received a Freud 8” Stacked Dado Set (SD208S) for Christmas but upon further research it doesn’t seem like it will work with my Ridgid R4514.

Thoughts? Do I need to move down to the 6” version, if so do you know if there is a difference in the one I listed which shows in a black case but the 6” one is called pro dado set and the one I currently have does not say “Pro” on it.