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The Supertech titanium retainer for spring SPR‑M1007D is specified for a 6.5mm valve stem and serves as the replacement retainer to secure spring and keeper interfaces. Matched to the M1007D spring family, it preserves installed height and spring‑seat geometry for engines requiring that 6.5mm stem configuration during valvetrain rebuilds or targeted component replacement.
Supertech Titanium Retainer for Spring SPR-M1007D 6.5mm Stem
