MSD 90 Degree Silicone Socket Coil Boots and Terminals 3321
The coil or distributor end of a spark plug wire runs out of real estate fast on a custom motorcycle engine. MSD socket coil boots are molded from high-temperature silicone in a 90-degree profile so you can route wires cleanly past other components without bending the wire or stressing the jacket.
Key Features
- 90-degree angle provides clean wire routing in tight engine bays and around surrounding components
- Socket style, designed for the coil or distributor tower end of the spark plug wire
- High-temperature gray silicone construction maintains flexibility and dielectric properties near heat sources
- Sold as a pair, two boots per package
Technical Specifications
- Angle
- 90 degree
- Style
- Socket (coil or distributor tower end)
- Wire Diameter Compatibility
- 8.0-8.5mm
- Material
- Silicone
- Color
- Gray
- Quantity
- 2 per package (sold as a pair)
Fitment Notes
- Fits any ignition system using 8.0-8.5mm diameter spark plug wire, universal application; no motorcycle model selection required
- Use at the coil or distributor tower end; use MSD 3311 (90 ) or 3301 (straight) boots at the spark plug end
- Use MSD 3503 mini stripper crimper to prepare wire ends before installing terminals and boots


James h. –
Perfect fit and quality