Replacement Pads specific to the S4 caliper used in the General Motors 78-88 G-Body cars 11" SS4+ front systems manufactured beginning 01/2019. These pads have been modified and are specific to this application. Systems built 12/2018 and earlier use standard DR1 pad. If unsure what pad you need, please contact our technical support, , Pad Fitment: Baer S4 calipers in GM 78-88 G-Body 11" SS4+ front systems built after 12/2018. , Compounds: Street or Race available, use drop down menu below to select , FMSI Number: N/A, Cross Reference: , , Notes: , Sold in axle sets , Street pads offer smooth and dependable stopping power in light to moderate conditions with low noise and dust levels , Race pads are a high friction compound best suited for race use and may produce higher noise and dust levels, Caliper hardware (8 pad abutments and 4 retainer bolts) sold separately, add to order below