where to buy Hub Centric rings

Guys , i have aftermarket Dick cepek 2 rims on my truck . They are 17X9 Dick Cepek lug centric . I would like to take up that extra space in the hub to see if I can eliminate some tire wobble @ 60 mph .
When I had them installed , I asked if they were road force balanced . The tire install monkey said they were but I knew there was no load placed on the tires as they were being balanced .
I am willing to spend a few extra bucks and try the hub centric thing on my aftermarket lug centric wheels .
I am looking for alluminum rather than plastic rings
Any assitance is appreciated .

 

I bought some plastic ones from https://www.justforwheels.com/index.jsp. They have aluminum ones too, just depends on the size.