2010-2015 Mercedes-Benz GLK Roof Racks

What's the difference between Solid vs Click-In Crossbars?

SKU	Name		USD
8-00-9670-BK	EXR 'WEEKENDER-9670' Black Crossbars - (2) 40" Solid bars, 1.76" above Rails	New	493.61
8-00-9776-BK	EXR 'WEEKENDER-9776' Black Crossbars - (2) 51" Click-In bars, 1.76" above Rails	New	655.1
8-00-9776-RD	EXR 'WEEKENDER-9776' Red Crossbars - (2) 51" Click-In bars, 1.76" above Rails	New	744.45
8-00-6671-BK	EXR 'CAMPER-6671' Black Crossbars - (3) 40" Solid bars, 1.76" above Rails	New	822.62
8-00-6777-BK	EXR 'CAMPER-6777' Black Crossbars - (3) 51" Click-In bars, 1.76" above Rails	New	965
8-00-6777-RD	EXR 'CAMPER-6777' Red Crossbars - (3) 51" Click-In bars, 1.76" above Rails	New	1099.04
8-00-6672-BK	EXR 'OVERLANDER-6672' Black Crossbars - (4) 40" Solid bars, 1.76" above Rails	New	1112.17
8-00-6778-BK	EXR 'OVERLANDER-6778' Black Crossbars - (4) 51" Click-In bars, 1.76" above Rails	New	1302.01
8-00-6778-RD	EXR 'OVERLANDER-6778' Red Crossbars - (4) 51" Click-In bars, 1.76" above Rails	New	1480.73