There are many versions of this stew throughout Argentina and Chile in particular. Some include peaches or apricots, others have a hit of tomato, while others still contain corn. Some are cooked inside a pumpkin, and it's also common to roast pumpkins separately and serve the stew in them. Of course, you can simply skip this altogether - it will still taste just as good.
Dried guajillo chillies are available from Monterey Foods (montereyfoods.com.au), Herbie's Spices (herbies.com.au) and Fireworks Foods (fireworksfoods.com.au).