Just wanted to share my experience with a set of DV's purchased from eBay. To be clear, I have no affiliation with this company, I only share because these DV's are half the price of the name brands.
I bought eBay diverter valves
The company is based out of Michigan, and primarily deals with Saab/Audi, so I figured I would give them a shot. The vales are billet aluminum (like the name brands) and come with three springs, so you can adjust the pressure. Having purchased FVD valves for my last PTT, the install and fitment with these was identical. I installed last October, and they have been flawless. Highly recommend!

 

What brands where they ?

 

I had posted the link, but it looks like it was edited out. The brand is KraftwerkTurbo.