When you purchase a TRD (or any brand) LSD, you rip out your stock differential to replace it with the LSD. When you replace the differential, there are a few Toyota OEM parts you should always replace at the same time (just like doing a clutch or engine).This is every part you should purchase when doing an LSD, all in one kit MVP has put together. This kit includes 2 bearings, 2 seals, 2 O-rings, and Toyota FIPG sealant (a.k.a. Toyota Black).Please choose if this is for the TT Auto, N/A Auto or 5-speed, or the TT 6-speed.