I've used the universal kind that have to be assembled on multiple bikes just fine. They are really cheap too, I picked a random 20 dollar one from amazon or ebay depending on if I wanted black or chrome at the time. For my scout, the belt guard gets in the way so I used a steel spacer on each mounting point to give more clearance. Since you are on a chief, I don't think clearance is as much an issue as size and strength. I don't recall seeing larger ones, but I'm sure the solid piece ones would work. I just avoid them because they are typically in the 100 dollar range, probably because they only fit certain bikes. Finding something like that with the right size for mounting is harder, but a lot of people like the EZ brackets and they are about the same price and readily available. If you are using throw over bags, the yoke might even hide the EZ brackets completely. I didn't like seeing them sticking out so I just reused my old throw over bags with a new bracket.