If I'm trying to access @parts not in "foreach" @parts are empty.

You don't show the updated code, but my guess would be that you still have my @parts = ... within the foreach loop (like in your OP), instead of declaring the @parts array outside of the loop (like in the code I outlined).

If you declare it within the loop, it's lexically scoped to the loop, i.e. not accessible outside of it.  Also, you'd create a new array instance on every iteration, instead of accumulating stuff in it.