Are you trying to change the radiator cap with the TRD
radiator cap? Or are you just looking for the radiator fluid? Anyway...
Do you own a 7gen Celica? 2000-2005 model? The TRD
radiator cap doesn't fit on the 7gen. The radiator fluid is in the plastic reservoir right by the Hood
latch near the fans. Toyota radiator fluid is red in color you can get a bottle of it at the dealer.
If you're trying to put the TRD
radiator cap onto the reservoir it won't fit. The caps have different threads. 7gen Radiator cap is plastic the TRD