These are the only 4 wheels I have like this that are exact matches of each other. My other thought was possibly it was thrown in the box as replacement for a lost one since I got this kit from eBay a long while back, but I donāt have the chrome sprue anymore to check.
Edit: After looking at a parts tree of said GTO kit on Ebay, those wheels do look very similar to the ones from the van kit, so your idea @Khils may be correct along with mine of throwing it in the box as replacement.