Toothed Mulching Mower Blades Replaces 133-8182-03 89914P 108-0954-03 Compatible with to ro Recycler Lawn Boy Ex Mark Walk Behind Mowers（2PCS）

What It Is

This is a set of two toothed mulching mower blades designed to replace OEM parts 133-8182-03, 89914P, and 108-0954-03. They fit select Toro Recycler, Lawn Boy, and Ex Mark walk-behind mowers, and are made for fine grass clipping mulching rather than bagging or side discharge.

Fitment & Compatibility

Before buying, verify three things: deck size, blade length, and center hole shape. These blades are typically for 21-22 inch decks. Measure your current blade’s length from tip to tip—these are usually around 21.5 inches. The center hole must be a 5-point star (common on Toro/Lawn Boy models), not a round or square hole. Check your mower model against the compatibility list: Toro Recycler (21-22” models), Lawn Boy (21-22” DuraForce or similar), and Ex Mark walk-behinds (21-22”). If your mower uses a different OEM number (e.g., 108-0954-03 or 133-8182-03), these are direct aftermarket replacements. Always compare blade thickness and offset (usually 0.25 inch) to avoid fit issues.

Key Things to Know

• Quality vs. OEM: These are aftermarket blades, often slightly thinner or softer steel than OEM. They may dull faster in sandy or heavy grass but work fine for regular residential use.
• Installation: Easy swap—remove the center bolt (use a block of wood to hold the blade), replace, and torque to 35-45 ft-lbs. Reuse the original washer and bolt.
• Mulching performance: The toothed edge helps shred clippings finer, but only if you mulch frequently (every 3-4 days). Tall, wet grass may still clump.
• Balance check: Always spin the blade on a balancer after installation to avoid vibration. Aftermarket blades occasionally arrive slightly unbalanced.

Should You Buy It

If you have a compatible Toro, Lawn Boy, or Ex Mark walk-behind and want a budget-friendly mulching blade set for regular residential mowing, these are a solid choice. Skip them if you mow infrequently (tall grass) or need premium steel for heavy-duty commercial use—go OEM or a higher-end aftermarket brand instead.