It´s necessary that you get the best brands for your bike.First:
Analize what you want to change on your bike. In the next step you should make a little research what the market has for you.
The US-Accessory-Market has the best stuff for chopper bikes like the
Dragstar. But the main problem is that you have to search bridely because the US-Market is fixed on old fashioned bikes like Harleys.
I will give you some links where you can find the needed parts
without any complicated search. I`ve done it in so many nights.