I'd be surprised if the Z-Spar furling system fell apart - I've a 2-year old one on my 21, and it's much better than the system it replaced.
What is there to fall apart? The bearings are pretty substantial for this size boat, and the foil is one piece (not joined sections) so is unlikely to fail unless it gets bent.
Also, Z-spars are really good for supplying spares, even for their old products.
Geoff
Parker 21 / 18 Dawn