See part B-8 in the diagram

Guard Mtg Screw Asm 180531

Works with your model 105R!

$6.16

Works with your model 105R!

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This part works with the following brands:

This part works with the following products:

Part# 180531 replaces these:

180531,

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This part works with the following models:

ERP Number: ERP8902998
Manufacturer Part Number: 180531

Brand	Model Number	Description
Ryobi	105R	Trimmer - 105r - Trimmers
Lawn Boy	51450	Trimmer - 15 In. Electric Trimmer
Toro	51620	Trimmer - Trimmer
Lawn Boy	51638	Trimmer - 28 cc Curved Shaft Trimmer
Toro	51653	Trimmer - Trimmer
Lawn Boy	51903	Trimmer - 18" Gas Trimmer
Lawn Boy	51904	Trimmer - 18" Gas Trimmer
Toro	51911	Trimmer - Trimmer
Lawn Boy	51912	Trimmer - 16" Gas Trimmer
Toro	51920	Trimmer - Trimmer
Lawn Boy	51921	Trimmer - 15" Gas Trimmer
Lawn Boy	61620	Trimmer - 16" Gas Trimmer
Lawn Boy	61638	Trimmer - 16" Gas Trimmer
Lawn Boy	61653	Trimmer - 18" Gas Trimmer
Ryobi	725R	Trimmer - Trimmer
Ryobi	725REZ	Trimmer - Gas Line Trimmer
Ryobi	IDC500	Trimmer - Ryobi Idc500 (304051231) Parts
Ryobi	Singer-GT2815	Trimmer - Ryobi Singer-Gt2815 (502010885) Parts
Ryobi	Singer-GTE2818	Trimmer - Ryobi Singer-Gte2818 (411088141) Parts