I purchased a costly car part that was to be rebuilt, and it didn't work at all, and only option for me is to send it back to them at a cost of nearly a hundred dollars. I lost my original core.
Now I am going to be out hundreds of dollars and my original part, which worked better than the rebuilt I got from Rockauto
so I'd avoid getting any sort of hydrallic rebuild part from these guys. Only get parts like oil filters, new stuff, not rebuilt stuff, that's my recommendation
there is no customer service, no way to tell them that I'd like to sue them