If you have any doubts,Please Email: myquikee@gmail.com detailed images and measurements of the post you are wanting to use, we will check it for you!The baseplates are engineer designed to fit the 100mm range of Australian standard concrete sleeper retaining wall posts. These steel posts are hot dipped galvanized and typically used with concrete sleepers 75 - 80mm thick.Often referred to as.H -PostC - post.45 - degree post.90 - degree LEFT / RIGHT post.Please check your posts for damage, burrs or thick welds.It may be necessary to remove these using a grinder with abrasive flap disk.Make sure you treat any exposed areas with Cold Gal paint.The baseplate as a built-in tolerance, so it should be a snug to passive fit.As an option you can use silicone adhesive, simply follow the "ADHESIVE HERE" diagram located on the underside of the baseplate.