High Output Chrome Ignition Coil | Sierra 18-29716 Universal 12 volt electronic ignition replacement coil. 12 volt high output ignition coil Oil-filled design and arc-resistant alkyd top provide superior insulation and cooling Fits most standard tower coil brackets Designed for use with Mallory UNILITE ignition, magnetic breakerless ignition, electronic advance computer, HYFIRE IV electronic ignition control and OE breakerless electronic ignition systems Replaces Mallory 29716, 9-29716 Replaces Sierra 18-29719