Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Can they mount to a Saris 901 bicycle bike mount roof rack? The 901 is a pretty beefy cross bar, 3" wide with a total circumference of 7 1/2"
Document: These racks are strong and mount easily on the roof rack using 2 hand-tighten knobbed nuts on each unit.
Installed  3 sets of roof racks on ladder rack in truck easily, carriage bolts were not long enough replaced these with different screws otherwise easy to install
The only complaint i could have is you must take care when putting your boat/kayak on them so as not to slide it across the cushions, as they will tear. but assembles fast and installs great. I have put all 3 sets on-top of my SUV. Infinity QX56. I have 2 12' kayaks and a 10' kayak securely stowed on top..Great and super fast shipping made it in time for my 16 mile trip down the Shenandoah.
heavy duty and look like the picture and the more expensive carriers A little difficult to get the bolts thru the rubber plate - let it sit in the sun for a while and they squeeze into place. Run the straps around your roof top rack also - more secure that way.Came quickly and as described
will not fit roof racks on a 2004 Chevy Avalance. Have to return. Would have been a good deal .
These are the cheapest J style roof racks. I did need to re paint, put on thicker pads and purchase nice tie downs straps, but they work very well and for the money a good deal versus triple the price for others.
FYI: These only work if the crossbars on your roof run across your vehicle from side to side, not if they run the length of your vehicle. I put these on a Ford Escape with the factor crossbars and it worked great. Very sturdy. They were quite difficult to assemble because the parts don't seem to be made with any sort of precision and they all have to fit together. The instruction sheet isn't very clear either.
One of the racks had fallen off the assembly line or something similar, as it had been ground away on one end to where the other side wouldn't fit. A bit of work with a file and some paint to fix the scratched area took care of it, but they shouldn't have sent it that way to begin with.The straps are fine for their purpose; if you need a bow tie-down rope, it isn't included, but may be unnecessary depending on your situation.
I may be able to squeeze the third one in, as it only needs another inch or so to fit properly.For the price, these are a good deal, and the only issue I have is the quality control for the slightly damaged part and missing hardware.
But once you get them together, they work quite nicely.
Answer: no