---
product_id: 10664207
title: "GLM MERCRUISER ALPHA ONE ENGINE COUPLER | GLM Part Number: 11500; Sierra Part Number: 18-2171; Mercury Part Number: 76850A2"
brand: "glm"
price: "E£ 3729"
currency: EGP
in_stock: false
reviews_count: 3
url: https://www.desertcart.com.eg/products/10664207-glm-mercruiser-alpha-one-engine-coupler-glm-part-number-11500
store_origin: EG
region: Egypt
---

# Compact 5x5x4 inch design Precision fit for vintage Chevy engines Direct OEM replacement compatibility GLM MERCRUISER ALPHA ONE ENGINE COUPLER | GLM Part Number: 11500; Sierra Part Number: 18-2171; Mercury Part Number: 76850A2

**Brand:** glm
**Price:** E£ 3729
**Availability:** ❌ Out of Stock

## Summary

> ⚓️ Power your legacy with precision-engineered coupling!

## Quick Answers

- **What is this?** GLM MERCRUISER ALPHA ONE ENGINE COUPLER | GLM Part Number: 11500; Sierra Part Number: 18-2171; Mercury Part Number: 76850A2 by glm
- **How much does it cost?** E£ 3729 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.eg](https://www.desertcart.com.eg/products/10664207-glm-mercruiser-alpha-one-engine-coupler-glm-part-number-11500)

## Best For

- glm enthusiasts

## Why This Product

- Trusted glm brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Upgrade:** Swap your old coupler with confidence and join the community of savvy boat owners who refuse to compromise on quality.
- • **Compact & Lightweight:** At just 7 pounds and a sleek 5x5x4 inch footprint, it fits perfectly without adding bulk or complexity.
- • **OEM-Grade Reliability:** Engineered as a direct replacement for Mercury 76850A, Sierra 18-2171, and GLM 11500 parts, ensuring flawless integration and performance.
- • **Vintage Engine Revival:** Seamlessly compatible with pre-1985 Chevy engines featuring 2-piece rear main seals, bringing classic power back to life.
- • **Durability Meets Precision:** Crafted by GLM with exacting standards to withstand marine conditions and deliver long-lasting engine coupling strength.

## Overview

The GLM Mercruiser Alpha One Engine Coupler (Part #11500) is a precision replacement part designed specifically for older Chevy engines (1985 & before) with 2-piece rear main seals. Compatible with Mercury and Sierra OEM numbers, this compact, lightweight coupler ensures reliable, durable performance and seamless integration for marine engine maintenance and restoration.

## Description

Replacement Engine Coupler compatible with Mercury 76850A 2 SIE 18-2171 GLM 11500

## Features

- Compatible with older Chevy engines with 2 piece rear main seals 1985 & Before

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | GLM |
| Brand | GLM |
| Item Weight | 7 pounds |
| Product Dimensions | 5 x 5 x 4 inches |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 11500 |
| OEM Part Number | GLM Part Number: 11500; Sierra Part Number: 18-2171; Mercury Part Number: 76850A2 |

## Images

![GLM MERCRUISER ALPHA ONE ENGINE COUPLER | GLM Part Number: 11500; Sierra Part Number: 18-2171; Mercury Part Number: 76850A2 - Image 1](https://m.media-amazon.com/images/I/6116ZR+UixL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect fit for factory replacement
*by R***N on August 22, 2021*

Perfect fit for the OEM replacement on my mercruiser 3.0L in line 4 Chevy block.

### ⭐⭐⭐⭐⭐ perfect fit
*by D***N on September 20, 2021*

Part came on time, fit and preformed flawlessly.

### ⭐⭐⭐⭐⭐ Same piece exactly that was on the boat and more ...
*by G***R on September 20, 2014*

Same piece exactly that was on the boat and more than 50% less than local marina, seems to work very well but will get out more since season coming to an end.

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**Shop now:** [https://www.desertcart.com.eg/products/10664207-glm-mercruiser-alpha-one-engine-coupler-glm-part-number-11500](https://www.desertcart.com.eg/products/10664207-glm-mercruiser-alpha-one-engine-coupler-glm-part-number-11500)

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*Product available on Desertcart Egypt*
*Store origin: EG*
*Last updated: 2026-03-04*