SLP Package
I think what you are asking about is additional SLP content beyond the base SS package. If so, you can verify this by contacting SLP (and you should also see RPO Y2Y on the SPID sticker), and the additional SLP door sticker may still be visable on the passenger's door jamb.
And lastly, the chrome ZR1s were an SLP option all the way through the 2002 model year, so they could certainly have been ordered on that car originally. The base wheel for 2000 was the silver painted 10-spoke, but many SSs were ordered with the chrome ZR1s from SLP instead.







