If it's not too late... make your own. Just get either some electrical conduit tubing, crush the ends, drill holes and bolt them in, or use a 1/4 or 3/8" thick by 3/4" wide steel bar. I wish I would have gone with steel bars, it would have looked a little bit cleaner than how I did mine with electrical conduit. It took me about a half day or so including painting them. WAY cheaper and just as strong.
The steel electrical conduit is something like $5 or so for a 10' piece, just bend it in half to fit it in the car. It's up to you whether to use 1/2" or 3/4", I think I went with 1/2" tubing and 1/2" bolts.
While you're picking up the metal stock, pick up a 1"x1" aluminum or steel box tube for front and rear frame bracing. That only took me about 30 minutes to install both of those.