Wilwood 140 12907 FNSL6R FRT HAT KIT12.88 Marin Hinkle Sexy Clips, Premium Member Access. Wilwood 140 12907 FNSL6R FRT HAT KIT12. 88 The unsurpassed braking capacity of the Forged Narrow Superlite 6R six piston caliper serves as the base of this group of 13 14 big rotor kits for these popular late model vehicles. FNSL6R kits are engineered application specific for simplified installation and full compatibility with OE master cylinder output and ABS functions where used. Big brake kits provide increased brake capacity and complimentary style with wheel, tire, and suspension upgrades on show cars and high performance street track machines. Optional caliper finishes and rotor designs simplify personalizing the style and braking requirements of any application.