I have two pair of Malone Downloader cradles that I use to haul my two kayaks. (14 & 15 foot) you just need to choose the base rack of your choice.
The big names are Thule and Yakima. Don't rule out Rhino-rack or Inno. I have an Inno rack on my OBXT and it is slightly higher quality than the Thule rack on my Crosstrek IMHO.
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Current: 14 FXT Premium & 05 Outback XT 5MT
Past Subies: 14 WRX hatch, 06 Legacy 2.5i SE 5MT, 98 Outback wagon