This universal swing shaft is listed as Kyosho part LA419 for LAZER ZX7.5. The marking (67/2pcs/ZX7.5) is the package identifier and shows the code plus the two-piece quantity so you can check it against your rear swing inventory on a 1/10 electric on-road chassis.
The shaft replaces the rear swing axle directly and restores the intended geometry and tolerance in the rear suspension linkage. Swap it in when the original shows excessive play or wear, or when rebuilding the rear assembly to regain consistent pivot alignment and handling repeatability.
Fit notes: LA419 is designed for LAZER ZX7.5 compatibility. Confirm the item markings and that you have the two-piece pack before starting work to ensure both sides of the rear linkage are covered.
Maintenance role: as the pivot shaft it helps maintain pivot spacing that affects roll centre and toe indirectly. While servicing, inspect the mating bushings and track areas for wear and replace any worn parts to prolong service life and preserve suspension geometry.
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