Most modern shocks use 1/2" bushes. This includes all Fox shocks and Rockshox / Manitou shocks from 2011 onwards. They can be pretty tight and anything softer than steel tends to deform under load.
Shock Bush Removal Tool + 2 x 1/2" Igus Polymer Bush - Fox, Rockshox, Cane Creek
Shock Bush Removal Tool for Fox, Rockshox, Manitou, Cane Creek (1/2" / 12.7mm)
Rockshox Shock Bush Mounting Hardware 30mm x 8mm inc DU Bush 11.4118.091.823
Rockshox Shock Bush Mounting Hardware 22.2mm x 8mm inc DU Bush 11.4118.091.809
Rockshox Shock Bush Mounting Hardware 25mm x 8mm inc DU Bush 11.4118.091.816
Rockshox Shock Bush Mounting Hardware 21.8mm x 8mm inc DU Bush 11.4118.091.807
