Just installed no problem. Bores are to specification. Just one problem - the rear ones use double sided tape and there is a clip for the top part. They supply another screw for the "optional" hole to be drilled. Since my truck has less than 1000 miles I won't drill a hole just yet. However, if the brackets don't hold, I'll have to do it. The bullbars are attached really well and securely without drilling. The included protective tape doesn't quite fit. I assume this is a common pattern. No problem as they cover the area that needs to be covered. You don't need the amount of water/soap solution they describe, but the mix ratio is an important part. They look good and are well made. I'm sure they will last for years and protect as described.