Left rear brake went kapow

Me brakes all the sudden felt weak on the '96 XJ today and I get home to find the inside of my left tire coated with something coming from the drum. Looks like it all came out when I was stopped because it's all in one direction. So what am I looking at replacing here...probably the cylinder? Checked the whole brake line system and all the connections are dry, just the fluid coming from the inside of that brake drum.

Other than the shoes which I think are fine, what all should I replace when I'm in there?

I'd like to go OEM considering it's the brakes but since it's the rear and I'm strapped right now I wouldn't mind going with a known good manufacturer.

Sounds like a wheel cylinder or brake line. It should become evident once you pull the wheel and drum. If you reuse the shoes you'll want to clean them with brake cleaner to remove the oil.
Don’t discount an axel bearing leaking into the brakes

Never look down on anyone unless you are helping them up - Jesse Jackson