That's a pretty common setup. It's probably held on to the subframe by a couple ball joints or bushings.

Yup it is: http://www.amazon.com/Dorman-520-973-Control-Arm/dp/B002H9H5E6/ref=sr_1_1?ie=UTF8&qid=1428641795&sr=8-1&keywords=2005+elantra+control+arm