Wow, confusing info to say the least. So, I am gathering from reading the post, the SRT and the limited flexdiscs are not interchangeable, Rock auto doesn't carry both discs, Someone got the Bilstein 2104101215 to work, but on what, an SRt or a limited? Maybe I will skip replacing this part until I know that it is bad for now since there is so much conflicting information on which one to buy.