Chevy Corvette ID

In the mid 90’s the Corvette went to 4 squarish instead of 4 round tail lights. I think It only lasted a year or two and they went back to 4 round tail lights. What year, or years was this?

Square tail lights were introduced on the ZR-1 in 1990 and the base model in 1991.

Thanks I’ll look.

Also, note that the Corvette was redesigned for 1997, with oval tail lights. The oval shape wasn’t particularly oval, and might be confused for round from a distance.