Superior Parts DB90-01 is a NR90AE & NR90AE(S) - Driver & Bumper Kit which includes SP 885-918 piston driver & SP 884-959 piston bumper.
SP 885-918 Piston Driver with O-Ring. Aluminum is crimped into the UNI-LOK grooves of the shaft to prevent unscrewing. Hardened steel lock tite and micro-mechanically locked piston driver interface. Guaranteed never to unscrew.
SP 884-959 Piston Bumper: Precision machined, virgin high density yellow color plastic framer bumper - PU Material.