ok more starter stuff

ok so i got the starter clutch out of my 1980 kz750 four, i can make it lock up with my hand, the rollers are a little worn but don't seem that bad, i checked the starter and it does spin the counter sprocket, so i don't know i went ahead and ordered the parts any way but i don't know if it will help, also on the outside of the clutch housing there are what appears to be rivits pushed threw the metal? they look worn , i don't understand how relevant that could be but i figured i'd ask
thanks
Rob