Turnigy Brushless Sensored 17.5T 1870KV Motor

I have to order a Turnigy Brushless Sensored 17.5T 1870KV motor. However this one is not in stock anymore, I'd like to know when I can expect it to be in stock again. If this will take a while, this motor will serve as a starter motor for a subaru engine and it has to support 4 cells (4s). What other motor can be used for the job if we want to keep the same batteries and turning speed per volt?