OK then,
JDParts will not have the buckets, you will have to go to the configurator, then build a tractor with a loader, then select a bucket for it to get pricing and part numbers, or go to your dealer...
I just went through this with the Power Beyond kit I wanted to buy. It would not come up on JDParts. The parts guy at the dealer said it was a "whole good" and that I would have to go through a salesman to get it ordererd. I did and recieved it 3 days later.