Sonnax O-ring GM-O-19V is an oversized version of standard, OE-sized Sonnax O-ring GM-O-11V. It can be used in GM 6L80 and GM 6L90 (300mm) torque converters with worn piston bores.
Be sure to resize the bore of the piston/damper assembly to Ø 2.555" ±.001". To avoid the risk of the O-ring coming out of the groove, do not exceed this recommended bore specification.