Part number：115-8420 144-6431 Compatible with Toro Model: 20330 20330C 20331 20331C 20339 20339C Compatible with Toro Model: 20350 20351 20361 20361T 20370 20371 20377 20378 20954 20959 21329 21761 This Trailing shield will help protect you from partials from shooting back and hitting you.And it's very simple to install and use Please Note: Fit all specs of above models listed, please consult owner's manual for proper part number identification and proper installation Product size: Upper bottom: 16-15/16 inch, Lower bottom: 17-9/16 inch, (Manual measurement may have slight deviation) These parts came plastic expansion anchors (see pix). Need to remove them from part and “lightly “ hold them with wide jaw pliers and install factory screw until seated. Install new guard in on mower and tap anchor/screw assembly into place and you are done. This part is used in 19 model(s): Model:20330 (22in Recycler Lawn Mower), Model:20330C (22in Recycler Lawn Mower), Model:20331 (22in Recycler Lawn Mower), Model:20331C (22in Recycler Lawn Mower), Model:20339 (22in Recycler Lawn Mower with SmartStow), Model:20339C (22in Recycler Lawn Mower with SmartStow), Model:20350 (22in Recycler Lawn Mower), Model:20351 (22in Recycler Lawn Mower), Model:20361 (Flex-Force Power System 60V MAX 22in Recycler Lawn Mower), Model:20361T (Flex-Force Power System 60V MAX 22in Recycler Lawn Mower), Model:20370 (22in Recycler Lawn Mower), Model:20371 (22in Recycler Lawn Mower), Model:20377 (22in Recycler Lawn Mower), Model:20378 (22in Recycler Lawn Mower), Model:20379 (22in Recycler Lawn Mower), Model:20954 (55cm Recycler Lawn Mower), Model:20959 (55cm Recycler SmartStow Lawn Mower), Model:21329 (22in Recycler Lawn Mower with SmartStow), Model:21761 (55cm Recycler SmartStow Lawn Mower).