Hey Bear,
Yes it looks like it's been hacked off, this is where usually the top and bottom bump stops are attached to.
I can't upload pics at the moment, but i;m sure if you do a quick google search you'll find pics.
Does your other side have the bump stops?
It usually doesnt extend much further maybe an inch or two and its open also to fit the bumpstops.
hope it helps.
cheers.
Andy