As you know, the anti-reversing (Sprague) assembly, sometimes called a sprague clutch, is a specific unit of assembled-gears designed to only rotate one direction. In some motorcycles it can be removed and replaced in-the-frame no need to remove the motor.
On the Warrior, the arrangement is a little different. The assembly is separated and is referred-to as the Starter Clutch. There are 6 recommended parts imo (see 5-75 items 1,2,3,4,6,7). Full job see 5-73 - 5-78.
IMO it's a mistake to selectively replace bits, they really all get beat-up. Others disagree.
The PARTS manual page C9 shows the true nature of the beast. You need items 16,17,18,19,20,21,25. You might need the 6 bolts item 22, and might need fixing bolt/washer items 24,26.
Here's the thing. Most often when this fails the motor will not start. But its robust and seldom fails (to this point in history). When the motor is running and cold I use an inexpensive mechanic's stethoscope to locate the source of the noise. If you wait until the motor is no longer running then you are shooting in the dark.
The grinding noise could be inside the starter motor. Loose magnets or failed bearings or a bad gear. So check the starter gear too (item 11) for wear or damage clues. If you replace item 11 then get items 10,12 too.
This work is not terrible on the Warrior, except you need a really-good 'holder' tool for the generator-rotor-assembly and maybe more than two hands because you need to break-loose the bolts without letting the crankshaft rotate. Plus same to hold the starter clutch from rotating while pulling those bolts.
I'm certain there are tips and tricks, but the service manual covers what looks to be all the nifty tools (based on my experience with my prior vstar1100 and othe old bikes, most of which have slightly different designs). Check page 5-76 for the holders. Sometimes I invent something from bits in the garage lol.
My worry is that you might buy all the anti-reversing parts and jump-in, only to discover the trouble is in the starter or at the primary gear behind the fixed timing wheel (other side of the generator shaft where the CPS lives). Or worse, the grinding could be crank bearings.
Mechanic's stethoscope might help you identify location of noise closely enough.
I'm certain others will chime-in too.