I just bought the Stant 11589 and it does NOT fit correctly. (Mine is silver with red lettering, but the same part number). It's hard to lock on, and nearly impossible to get off. Ackkk.

THE ABOVE WAS AT PEP BOYS AND IT HAS WHITE LETTERING. JUST PUT MINE ON LAST NIGHT AND IT FITS PERFECT. MAYBE YOURS WAS MISMARKED IN PACKAGE. OLE YLLR