Sonnax O-ring GM-O-12V is an oversized version of standard OE sized O-ring GM-O-8V. It can be used in BorgWarner 310mm LU (Chrysler A618) torque converters with worn piston bores.
Be sure to resize the bore of the piston/damper assembly to 2.269" ± .001" (57.63mm ± 0.03mm). In order to avoid the risk of the o-ring coming out of groove, do not exceed this recommended bore specification.