i'd pick this up on whatever order you started with. you'll break a bowl eventually and be glad you have this.
I've used 2 different glass funnel bowls. The one that came with my lavoo mp3 was amazing. The one that came with my friends roi looks almost the same but doesn't smoke very well. I've had 2 slightly different carbs as well. No 2g glass pieces are going to be perfectly identical. There's ways to adjust and make it work. I love my glass bowls.
Order delivered fast, good customer service. Nice little funnel bowl that fits my glass hookah so it does the job