Needing Some 8 3/4 Gear Ratios 489 Case 3.23 and 3.73

Hello,
I am needing a few rear gear ratios for our cars. All need to be 489 case setups but we need them in a 3.55 and 3.73 ratio. Just need the ring and pinion not whole pig. Looking for rust free pieces that will not whine when set up. Thanks Mike