Vauxhall Cavalier ones will fit with a bit of ingenuity, too!!
If you are not too much a purist, get,as our Scots sage says, a secondhand Mini one(bear in mind that a new one is stupidly cheap, though!). If you can't get the correct mounting bracket, use your old one, with a long M8 bolt/nut and a selection of M10 nuts as packing spacers(this is the really cheap end of the scale!!). Most important is to make sure the pulley is close(ish) to in line with the existing driveline. Again, the odd washer as packing here and there will sort that out. Wire the two big terminals on the alternator to thebattery side of the starter solenoid-they are duplexed to carry more current than one terminal. The little terminal connects to the ignition warning light, on the "negative" side of it, ie: the other side of the bulb goes via the ignition switch to +12volts. 99.9% of people seem to need this connection via the bulb to "excite" the alternator and make it charge (doesn't excite me much, though).
The other 0.1% of people may also tend to never have ignition coil problems
