Both the Landing Pad 6 and 7 and are used for custom applications. The difference is the type of mounting hardware each has.
Landing Pad 6 is used in caps, or other applications where you can gain access to the bottom of the roof, these use a "cap nut".
Landing Pad 7 is used on sheet metal applications such as the roof of a car where you you cannot easily access the bottom of the roof. These use a "Blind" fastener and should only be used in sheet metal. Please note, the LP7 is is only rated to 100lbs.
The dimensions are the same for both the Landing Pad 6 and 7
Weight: ¾ lb. per pair
Height: 4-¼ in. from base of Landing Pad 6 to top of crossbar.
With either the of the above Landing Pads you will use the SkyLine tower.
If you have additional questions please contact customer service here, or by phone at 888-925-4621 M-F from 7 to 4 PT.