I have six chromed plastic center caps for sale that came with my Torque Thrust D wheels. These fit the "D" model and earlier wheels, listings for the caps average $20/ea., I'll take $36.00 for all of them, included with each cap is the hardware and Allen key.
Online ad showing these caps:
https://www.jegs.com/i/American-Racing/286/1055001/10002/-1~Steven