Installed two of these on my Briggs and Stratton 20hp V-Twin engine (Model # 407777-0128-E1) and they fit and work perfectly. The local dealer said I was sold the correct part, but I had to replace the cooling fins on my engine to make it work. Em.NO! I found these two coils and they fit with no modification. ALSO! I've read that some couldn't turn off the motor electrically with these coils. Mine worked great. Turns off the spark with the key as expected. 100% satisfied.