Haha, I've every benz jack I've have around has ground to a halt a while ago....sorry.
As far as a spare...I'd recommend getting a steel rim to throw a full sized on. I've got a few alloys but you shouldbe able to find something locally if you're not overly picky.
Plate bracket...doubting there's one kicking around here that'd be worth while. I will keep an eye out and if there's a nice one, it's yours
-HIMMM