Half-Life: Decay Human Grunt Replacement
'Half-Life: Decay' Human Grunt Replacement For Half-Life: Source
I just ported the Human Grunt models from the Half-Life: Decay mod/game that can be found on Moddb.
This will replace the original Human Grunt models found in the base game of Half-Life: Source.
Install the 'custom' folder into your Half-Life: Source installation: (Typically C:/Program Files(X86)/Steam/Steamapps/Common/Half-Life 2/hl1/)