For Late Series I; Series II. Some hydraulic brake light switches won t activate your brake lights under light pedal application. (Just the thing when Britnee is, like, totally texting her BFFs and doesn t notice your slowing E-Type.) These kits employ a reliable mechanical switch mounted right on the brake pedal and allow precise adjustment to your liking. The early kit is for cars with the original switch located on the picture frame. This later kit is for cars with the switch located near the brake booster. Easy installation using existing wiring. One hole must be drilled in the firewall to provide a wiring entry point.