Product review (5 stars): Good.
Mine included three coupling. Build and material quality seems good. Install was fairly easy but the fit is so tight I had to 'tap' it much harder than I'd like (even with grease), -1 star but +1 for the extra coupling. Installed on a Kenmore, heavy-duty top-load washer, model 110.16202...something (oops, forgot the rest of the number).

Original part failure is probably end of service life (~25+ years of a few medium-size loads a week), the plastic cracked on motor coupling around metal fitting between coupling prongs then the metal rounded out, causing the motor to just spin. Sears has a good step by step tutorial on replacement, no surprises or uncertainty, but their part price was ~50% higher and shipping ETA was slower (without paying more). Only gripe is I can't find a PDF copy of the service/repair manual for this model.