All the loaders have the same basic parts
The LA450S-2 is the most common loader that was used on that model.
The LA452S was an upgraded loader, better valve.
The LB series was an economy loader and they are not very common.
All in all finding any of these loaders is going to be a rather difficult task.
Not only do you need the loader, you will need the subframe and all of the hydraulics.