Here's a link to an outfit I've bought Hub Centric Rings from. And their pull-down menu makes it easy to find what you need. They are 1st-Rate!! I've got a set of the plastic version on my SSGT that has the Enkei PKR rims installed. They work fine.

In fact, when I bought the rims from a local Discount Tire store, they installed a set of aluminum hub centric rings that were close, but not exactly what was needed. The ID was small by about 1 mm and the wheels had to be forced onto the hub. Found this out a day later when I was installing some front brake pads. When I confronted them about it, they said they didn't have the exact units in stock & used something close. What a half-*** outfit!!!! Metal rings & not the correct size!!! I got the Store Manager fired when I reported this lack of technical capability & customer service to the main office.

I ordered what I needed from above link and got them shipped overnight.