I have a 95 Club Car. I am installing a rear seat in back and want to beef up suspension with heavy duty rear springs. I have found some double eye springs that measure 27" from eye to eye. They are rated for 1500lbs capacity and are 4 leaf. Also the eye diameter is 9/16th inch. Is this leaf too stiff compared to the Club Car heavy duty springs? Also are the Club Car bushings designed to fit into a 9/16th hole in the leaf. I just bought the cart and would like to avoid paying the high dollar for the Club Car springs if these are suitable. Thanks for any help on this.