You don't want to use a thicker cutting edge as you will lose cutting action.
The 4T-6531 edges are the right ones for your blade.
You should be able to change any of the blades or end bits without changing the others.
Clean the blade and the back of the new blades with your grinder
Make sure you tighten the new bolts tighter than you think they need to be..
Block the blade up so it won't mash you.
Be careful.
Check you fan belts and wash out the radiator .
if you have a reversible fan put it on push.
check the water every time you start the tractor.
Good luck
Bob
The 4T-6531 edges are the right ones for your blade.
You should be able to change any of the blades or end bits without changing the others.
Clean the blade and the back of the new blades with your grinder
Make sure you tighten the new bolts tighter than you think they need to be..
Block the blade up so it won't mash you.
Be careful.
Check you fan belts and wash out the radiator .
if you have a reversible fan put it on push.
check the water every time you start the tractor.
Good luck
Bob