489 3rd memer gears

My dad asked me to order for him the inner small sun gears for his 489 case that tie the outer larger gears that the axle splines go into together for posi. His are shot. I can't find them. I am not sure if someone coudl tell me exactly what to look for or a link to where I could purchase?

Thanks a lot

since you have a 489 case you probably have a cone type carrier --- spider gears for those carriers are NOT available anywhere --- open carrier spider gears are NOT the same as the sure grip parts -- if you are lucky maybe someone on here has a damaged sure grip with good spider gears they can sell you.-- if a clutch type sure grip was installed into your case you can buy a complete internal kit to replace the stock damaged gears. --- since the spider gears are shot the case probably is too ,,, just buy a new sure grip carrier and install it .Auburn , True trac , Power lock type.