Crossbar screw size

[Lilliemae0331]

Hi all! I bought crossbars for my ’16 Yukon on ebay. When I received them, I found that they did not supply the screws to install them. Does anyone know what size screws are needed to install the cross bars? Thank you in advance!

 

[markni12301]

For me, that would be tough without specs or pics. I don't recall what I bought awhile ago. Maybe someone knows offhand. Try taking the crossbar to an automotive supply shop. The trick is getting the flaired head the right size. See 1st pic.
Tip: I went to the hardware store to get stainless steel bolts and washers, ss and rubber, for the holes I wasn't utilizing so water won't get in. See 2nd pic.

 

[greenhornet]

Metric 6 mm.