Swagman 2-Bike Ball/Hitch Mount Bike Rack
I've used this bike rack a handful of times with my FM hitch on the Miata. Works like a champ but I bought a carbon bike so I need a platform rack instead. It's in perfect shape, includes two keys for the locking mechanism. Cost from Amazon with shipping = $77, I'll take $35 if you pick it up. It will fit in the trunk of a Miata, btw. If you want it delivered in the Metroplex, it's $35 plus you buy me dinner.
(Amazon description for reference: http://www.amazon.com/Swagman-64095-.../dp/B0009NZL2K )