This system features the 4-piston, S4 caliper mounted to a 11", 2 piece slot, drill, zinc plated rotor. Billet aluminum hubs come assembled with premium bearings packed with Redline synthetic grease and billet dust caps. Rotors are pre-assembled with NAS high grade stainless hardware. All mounting brackets, stainless braided hoses and hardware are included and comes assembled on modified stock spindles. The 11" SS4+ is designed just like Baer's larger systems, but in a smaller package for 15" wheels., , | Rotor Size/Type:, 11" x 1.020", 2-piece, , | Replacement Rotor Rings:, 6910354 (Left) / 6920354 (Right), , | Caliper/Piston Count/Mount Type:, S4 / 4-piston / Lug, , | Replacement Pads:, DR1-C (Systems built before 1/2019), DR1-C MOD (Systems built 1/2019 to current), Contact if unsure which pad you need, , | Minimum Wheel Size:, 15" (Use template to verify fitment, link below), , | System Includes:, Calipers, Brake pads, Rotor & Hat assemblies, Billet aluminum hubs w/premium bearings, Billet dust caps, Modified stock spindles, Brackets, Stainless braided brake hoses and all mounting hardware, , | Track width Increase:, Increase track by .400 a side , , | Notes: , System comes completely pre-assembled on stock spindles, Fits stock GN & T-type wheels , , | Applications:, - 1978-87 GM G-Body cars