This aftermarket lower spring retainer is a metal replacement supplied as a pair for HPI Savage 21 scale trucks. It is intended to seat the lower end of the suspension spring on the shock assembly and to preserve consistent spring position during repeated setups.
As a precision alloy component, the retainer provides a robust alternative to standard plastic cups and is intended to assist repeatable preload settings and quicker spring changes. Confirm dimensional compatibility with your Savage 21 shock lower cup prior to installation.
Assembly notes: install the retainers with the spring seat facing into the shock, retain existing hardware according to your shock specification, and verify full spring travel after installation. No additional mounting hardware is included unless specified by the seller.