Mercruiser Shift Cable Guide | Sierra 18-2149 Sierra Shift Cable Guide 18-2149 Cable end for attachment of intermediate shift cable to shift bracket on Mercruiser Alpha & Bravo stern drives. Sierra shift cable guide For Mercruiser Alpha and Bravo stern drives Replaces Mercury 43433, 29880, 20175, and 22879 Replaces Mallory 9-72150 Replaces Sierra 18-2149E