i have a vw with the oem bars which are just like the rapid aero bars from thule...

my question is what are these xadapter kits? (i know what they are from the picture but)

can't i just go to homedepot or lowes and get a similar square headed bolt and cut it down
to size instead of order one of these kits online?

so no local carriers and every place I've found wants about 7-10 dollars to ship it to me...and the online store where i am getting my bike carrier doesnt sell them (thanks jenson)....

any info on this subject would be greatly appreciated.... thanks