741 case 3.23 gear set

I was looking to buy a 3.23 gear set for my 741 case but the only sets offered are 3.55 and 3.73. Doing a google search I see that 741 cases did come with 3.23 gear sets. So Im curious, why are they not made anymore? Which probably cant be answered, but is it safe to buy a used gear set, if I can even find them?