identify louvers
 

I recently purchased some car parts from an estate sale. There were a few Oldsmobile parts in the purchase and a pair of what appear to be non functional hood louvers. If these are oldsmobile cutlass louvers, I cannot identify the year car they were on. I`ve attached photos, the numbers on the back of the louvers are the same, 412283 and KBC 33512. Thanks in advance for your help