The following applies to these mast style hitch racks: SwingDaddy, RidgeBack, LiteRider, LongHaul, RoadTrip
Racks made between 2014 and early 2016 originally came with the the standard ZipStrip Cradle, units made after April 2016 shipped with the "SuperCush" Cradle and ZipStrips.
The new "SuperCush" Cradle is compatible with the older product made prior to April of 2016. Below are images of both cradles with links to the replacement parts. You may also want to read this article about the difference between the standard and SuperCush ZipStrips
Standard ZipStrip Cradle PN 8890304 Discontinued Standard ZipStrip Cradle w/anti-sway PN 8890305 Discontinued
The following applies to these mast style hitch racks: FullSwing, FullTilt.
These racks use a different style of cradle that runs on a track. There are two different cradles available, one for the new SuperCush Zip Strip, and one for the standard ZipStrip.