Description 20v 4age – Extended #4 ignition lead This custom lead is 50mm longer than the longest lead of the original 20V 4age ignition lead set. This is required for people using kits that move the distributor cap to the front of the engine as part of a rear wheel drive conversion. While this is not a genuine product it’s made to a similar construction and look to the original, so it will not look out of place.