I can't bring myself to eat the shipping on a second rear upright, so I'm going to wait until another local does a Corally order, or wait 'till I need more parts.
But, in the meantime, I'm thinking about only running the new arms in the front, since that's the only place I ever really break them, and even then it's rare these days. I know Sushi Boy made a joke about this, but... is there any reason to think that using the new arms up front (with the same shock position as the old arms) and the old arms in the rear would be a terrible idea? I don't run sway bars or anything, so that part of it isn't a big deal to me.