Valve spring retainer for 260/289 before Change/L10 (1963-1965).
OE replacement style, 7-degree valve lock (keeper) design.
16 pcs per car, 8 pcs per cylinder head.

Outer diameter: 33.96 mm (1.337").
Diameter, first step: 25.4 mm (1").
Height: 9.71 mm (0.382").