I have an inexpensive pyrex bong that I really like, except that it has a cheap downstem. This was/is my only glass piece and I would really like to convert it to a glass on glass bowl and downstem with a diffuser and an ash catcher. Most of the parts I've seen are specific to brands of bongs. Where can I find the parts I need to do this conversion? The headshop I bought the bong at would help me out but it would cost way to much like 100+ and for that I might as well buy a new bong. Any suggestions on reliable websites that sell that stuff? I dont think that gc does but I could be wrong so it should be ok to post right?