RipjawsZ are working great on Z87 too. Generally all G.Skill kits are designed to work on every available Intel platform. Almost all new kits have big sticker that they're compatible with Z87 chipset even though there is no info on the G.Skill website.
In my sig is link to some of my tests with RipjawsZ ( 16/32GB 2133 ) , TridentX ( 2400 CL9/10 ), RipjawsX ( 1866/2133 ) and ARES ( 1866/2133/2400 ). All were working on Gigabyte Z87X-OC without issues.