Description
Sierra 18-2161 marine shift arm. Fits: MC-I, R, MR, Alpha One & Gen II. Replaces: GLM 21140, Mallory 9-72153, Mercruiser Stern Drive 45518A2, 45518A3, 45518A1.
About SierraSierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of the product against any defects in workmanship and materials.
![Xantrex C-Series Solar Charge Controller – 40 Amps [C40]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/xantrex-c-series-solar-charge-controller-40-amps-c40.webp)
![Blue Sea 7605 BatteryLink Charger – 10Amp – 2-Bank[7605]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/blue-sea-7605-batterylink-charger-10amp-2-bank-7605.webp)
![Jabsco HotShot HD4 Heavy Duty Washdown Pump – 24V – 4 GPM – 60 PSI [Q402J-118N-3A]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/jabsco-hotshot-hd4-heavy-duty-washdown-pump-24v-4-gpm-60-psi-q402j-118n-3a.webp)
![Blue Sea 7542 C-Series Flat Rocker Circuit Breaker – Single Pole – 15A [7542]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/blue-sea-7542-c-series-flat-rocker-circuit-breaker-single-pole-15a-7542.webp)
![Jabsco Mag Drive Centrifugal Pump – 14GPM – 110V AC[436979]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/jabsco-mag-drive-centrifugal-pump-14gpm-110v-ac-436979.webp)
![Blue Sea 1455 4 Position Switch CLB Square[1455]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/blue-sea-1455-4-position-switch-clb-square-1455.webp)