UNIVERSAL CROSSBAR 4" ROUND. 
Universal round crossbar that has 4" diameter. 
It has 6 threaded holes 8/32" each and spread as follows: 
4 holes are 2 3/4" center to center, 2 holes are 2 3/4" center to center. Middle hole is 1 3/4" across. 
$2 minimum charge orders less than $20. 
$.50 packing charge for each parts box.