There are a couple good sources for G2 files.

Try the unofficial swap page.
http://zeus.rcwizard.com/fubar_hill/G2.htm

The plane i use is called Cap 232 2x, i don't remember where i got it (not from the above link), but there are similar ones on this page.

I suspect there is an official Real flight swap page. You might want to check with Real Flight for the location.