My Yakima looks like it will fit square bars or round.
I'm not sure how commons square bars are, I thought those were many years back, my point. Make sure what ever carrier you get it will allow you to use square bars.
Hate to see ya buy something and then it won't work for ya. That's never fun
As long as the attachment's mounts fit the type of cross bars you have. Round, square, etc,.. it seems most things will mix n match!
I got a super deal last fall on an REI garage sale return of some Yakima round bars and Q towers, along with a Thule Kayak carrier,.. and then this last Feb, after I got my dividend check. I used my 20% off coupon to take off the sale price of a Yakima MTB carrier? I got a $200 bike rack for less than $35 out of pocket!!
In the end, I think I'm under $375 for $800-$900 worth of roof rack!!
You're only Young Once,.. but you can be Immature FOREVER!