From what I can see, a vendor may have a part manufactured and carries it in their line of products. I think they also sell the part to the other vendors. Each vendor seems to have certain parts they have manufactured and sells them and has an agreement to sell the other vendors the same part at a discount so that vendor can carry the part at an agreed price and make a profit when selling it. I know this is the case with Fenton headers and I feel for the most part it's the same with many of the other parts.
Basically this means that most all of the parts are the same and it really boils down to the vendor's service.
Joe
