Definitely ask Squier first - it only costs an email!
wanted ad has to be second - someone has got to have upgraded some of these in the past, and has a full set of 4 lying around doing nothing.
other options.... There's one on ebay for £5.99, plus £2 postage, or a full used set of them for £16 (or best offer).
Not sure what they're made of, probably a cheap steel, but the zinc plating makes it hard to weld it back on, so I would try something like silver soldering it, if you can find someone with the knowledge and kit (if you could let us know whereabouts you live, local folks might offer to help!)