left over ceiling fan pipe
I think they are 1/2 ID pipe about 5 -6 foot long. They were being thrown away and I was going to use them for a Strut Tower Brace on my Trans Am, but never got around to it.
The Top box was mounted right behind the seat where the backrest is, but my wife didn't like the backrest on the topbox so I had to move it back quite a ways back actually so the lid would open enough to slide things in the case.
Wife is pleased and my pocket penny pinching self feels great too. I hate painting and prefer function over looks so It may need to be touched up in a year.