Common "wearable" parts for Rivet Busters are generally Upper Sleeves, Lower Sleeves, Poly Bumpers, Retainers, and Retainer Springs. You can find some of these parts listed on this website along with the most commonly used bits or chisels, however prices vary for Retainers, Pistons, and Valve Assemblies so you will need to contact us for price and availability on parts you do not see.