All my Mov't Questions

[llsteve80]

I know some parts of the 2836 are compatible with the 2824, like the keyless works and stem but not the date disc for instance. What is the 2834 exactly? And now that I think of it, which model has the day disc, the 2836 or 2836-2? Or is it both just as an added feature? Can I add it myself?

Now, how about those sellita movements that will be replacing eta? I hear that they're good, anyone know of a source yet? ofrei.com doesn't have them and either does cousins or ebay.