Existential sentences that used to be but are no longer I'm trying to construct a sentence along the lines of, "There were two hard parts...," where I use the existential 有. The issue I'm having is how I convey the meaning that this 'existence' is confined to the past. Should I be using the perfective aspect 了 like:

有了两不好的部分。。。

Or should I include some clause afterwards to indicate the new state of things:

有了两不好的部分。。。现在都没这部分了。

Or is there some other way to do this that I'm missing?
I'd suggest you adding some time information in the front to emphasis the fact it is in the "past" as that is definitely unambiguous. 


以前 有兩個不好的部份...
之前 有兩個不好的部份...


Alternatively, these ones can also be used. They means "originally", which implies "in the past, and now changed"


原本 有兩個不好的部份...
原來 有兩個不好的部份...