Any ignition-type condenser of a similar size should swap ok. Don't buy some electrolytic or something from radio shack.. Steal an ignition-type condensor off an ignition.. or get one from an autoparts store.. They won't like wasting their time searching for a particular physical size.
yeah, the uF is microfarad.
A capacitor is nothing but two strips of metal foil wrapped into a cylinder. The square inch area of the foil determines capacity. So the physical size of the can approximates capacity.
Almost all ignition-types are conservatively rated at 12 volts or more so break-down voltage will be higher than needed.
Since yours has 3 wires, you'll need to solder two more wires onto a single-wire condenser.
A failed experiment won't damage anything.. if the new one's capacity (29uF) is off a bit, your points will arc a bit more than they otherwise would.