Brand new Auburn Limited Slip, something missing?

The problem is that I bought here in Sweden about a year ago but didn't have the time to mounted it. This winter i was planning to mount it but when I packed it up I notice that there was no preload springs or spring retainer mounted, it looks just like an open diff
The reseller claim that they have to be contacted whithin 12 mounth to use warranty.
So I must fix it by myself.
Is there any chanche to buy these preload springs and spring retainer? any partnumber I should search for?

IMG_3250.JPG

IMG_3251.JPG