SD Lighting offers A Pillar brackets that are made with 100% Chrome Molly Steel.  Our brackets may cost a bit more, but they will NOT break.  Tested in the rigors of Baja and raced for thousands of miles without 1 failure.  In our book, these brackets are worth every penny more.  Our SD-911 mirrors brackets come in several sizes.  1.75" Kawi/Honda/Yamaha/1.86" Can Am X3  and 2.0" Polaris and some others and they allow full use of windshields from most manufacturers with our mirrors or A Pillar Brackets with or without mirrors attached.