Feature: 1. Application: Ignition module replaces Mercruiser, replacement for OMC 4 cylinders. V6 V8 engines with Delco breakerless distributors. 2. OE number: 811637001, 811637T, 1851071, 3854003 are the reference numbers. Please check the part number of your item. 3. Sturdy Metal Construction: Made of high hardness metal material, the ignition unit is wear-resistant, impact-resistant and not easy to break. 4. Original Standard: The ignition module is designed to meet or exceed OEM specifications, dedicated to the special car model. 5. Ideal replacement: professional manufacturing, high performance, high reliability, perfect for your rebuilding, repair and maintenance needs. Specification: Item Type: Ignition Module Material: Metal OE: 811637001, 811637T, 18-5107-1, 3854003 Fitment: Replacement for Mercruiser, Replacement for OMC 4-cyl. V6 V8 engines with Delco breakerless distributors. Package List: 1 Ignition Module Note: 1. Please check the part number of your item, the relevant information is for reference only. 2. If you are not sure about the item, please contact us before purchasing to avoid unnecessary return, thank you