Thanks for the info.Whispbar kits are compatible with our Trackhawk/SRT rails. This company was purchased by Yakima but there are still some places with old stock Whispbar for decent discounts (i got my whole set up for $200!!).
Whispbar (SETS of 2):S17w (through bars) or S25w (flush bars) or T17w (heavy duty through bars)
Whispbar K624w fit kit for any of the above.
Whispbar individual bars can be purchased as well (S5 and S6) instead of the S25w set (which is just that S5/6 combo)
Yakima has their version called the Flushbar and you would need one of the 37.5in (SMALL) and one of the 39.25in (MEDIUM) bars. These would require the same fit kit.
Incredibly easy install and removal.