For larger Kubota BHs and Mini-Ex, look at the Ox Thumbs ripper.
They make rippers to fit the Kubota QA coupler .
I have one, and it is excellent!.
Though, a bit pricy, at $1,000, plus another$1,000 for the quick connevtor.
I think that the "teeth" are just frosting for that cake.
My 28 "OX Thumbs" ripper on L48 TLB, does not have serrated teeth.
Works just fine, with the machine's hydraulic power doing all the ripping work.
Nope!
Rustoleum is not "equivalent" to OSPHO.
OSPHO combines with surface rust, and acts as a primer.
Paint is needed over OSPHO, to properly protect the metal.