I think your wrong Hybrid DET. I think the b12 has trailing arms and the b13 has an axle.
Here's the email i received from Koni talking about their shocks for the sentra
The S stands for Sport which describes the type of valving these inserts have.
These are going to be yellow in color but we do not make a blue street shock
(but we do use blue for some of our Rail shocks). The valving of these is
designed to give you the best possible handling while still maintaining a
streetable ride. These are also adjustable for rebound damping to match a
variety of spring rates as well. If you have any other questions, please let me
know. Thanks.