Posi Gears

Ok now i have an 89 4x4 s10 blazer and i bought an auburn posi for 1988 and newer 7.5/7.625 rears. Then i bought some gears from an 02 camaro and the gears wont fit over the hub on the posi its a 3.42. Do i need new gears i was planning on buying richmond gears, or motive gear 7.625. Or do i need a spacer and everything is for series 3. That and is 200 for the rebuild of the rear a good price for labor, it includes replacement of all bearings, and proper pinion and carrier spacing.