: what did you use for hardware to mount the the rack?

Addison - you can get the Yakima adapters that attach various fittings to the cross tube, as well as the large wing nuts they use from any large Yakima vendor. In my case, I got them from the local REI. They come in bags of 4 which worked out well for me. As I recall, the clamps were about $2 each. I don't recall the price on the wing nuts.

jrs