964-04007A 664-04007 Grass Bag Compatible with MTD Troy Bilt 21" Lawn Mower Grass Collection Bag for 664-04011 664-04027 664-04034 & More - (No Frames)

What It Is

This is a replacement grass collection bag (part #964-04007A / 664-04007) designed for 21-inch MTD and Troy-Bilt walk-behind mowers with side-discharge or rear-bagging decks. It catches clippings during mulching or bagging operations—no frame included, so you reuse your existing support frame.

Fitment & Compatibility

• Deck size: Fits only 21-inch mower decks. Measure your mower deck width before buying.
• Brands: Compatible with MTD, Troy-Bilt, Cub Cadet, Yard Machines, and Yard-Man models that use OEM bags 664-04011, 664-04027, 664-04034, 664-04007, or 964-04007A.
• Frame required: This is a bag-only replacement—you must have a compatible frame (sold separately) to attach it to the mower. If your old bag ripped but the frame is intact, this works.
• Check your mower model: Look up your mower’s model number (stamped under the seat or on the deck) and cross-reference it with the OEM part numbers listed. Not all 21-inch mowers use the same bag attachment.

Key Things to Know

• No frame included: If your frame is bent or missing, you’ll need to buy that separately. The bag attaches via a plastic hook-and-loop or snap system to the frame.
• Material: Heavy-duty woven fabric with a plastic stiffener at the opening. It holds up well but can wear at seams if overfilled.
• Installation: Easy—slide the bag onto your existing frame, secure the straps or clips, and attach to the mower. Takes under 5 minutes.
• Common gotcha: The bag fits most 21-inch MTD/Troy-Bilt models, but some newer mowers have slightly different attachment points. Measure your frame opening (roughly 8” x 12”) before ordering.

Should You Buy It

Yes, if your original bag ripped but the frame is still good—this is a direct, cost-effective replacement. It’s not for mowers with integrated bag systems or non-MTD brands. For $28.69 with solid reviews, it’s a reliable fix for most 21-inch MTD/Troy-Bilt users.