I haven't myself.
In my mind welded is better than bolted.
Yes.
With that said, you can buy your own material, cut to fit and weld them in. I put a set in my car for 40 bucks and a little work.
There are numerous threads on this subject, at least 2 right now up and current. You can get some good ideas there for making your own. Of course you'll need a way to cut them, and then to weld them in.
