Piragis has a good selection of yoke pads and one is a premium "collar" type that you bolt on.

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  They also have a couple of different style of clamp-on pads.
I have these and really like them.

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I like that you can adjust them for width and angle to suit your shoulder width and how they ride on your pack straps IF you portage with a pack. I like the most options I can get, but that's just me.

These come in bolt-on or clamp-on and might be good too, but with that curve, I don't think you could flare them like the previous item I referenced?

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It really has a lot to do with your body type and individual preference. I suppose you could order both types and send one back. OR if you live close check them out in person.