Bike rack that fits 2" bed extender

Hi everyone,
I currently use a Harbor freight bed extender to transport the yak in my Tacoma.  It would be nice if I could use the L piece of the BE as a bike rack support by putting the short end into the hitch, and the bike rack onto the long end.  All I would need is a bike rack with a 2" female port.  Rather than buying the whole hitch bike rack setup with the hitch adapter, does anyone know where I could only buy the top rack piece I need? 

Good idea.  I am planning on buying the HF extender too so I can transport my 14’ OK scupper pro.  You might have to get some custom welding done if you can’t find a rack that plugs in.