I bought new 2008, 2011 and 2012 Impala LTZ models. I now own a 2014 Impala 2LTZ, purchased new.
One of the older models (2008 or 2011?) came standard with the ACDelco beam wiper blades. They worked very well and I bought replacements from the dealer when due (but they lasted a long time and were very quiet.).
The 2012 & 2014 models came with plastic / rubber standard wiper blades - which work well. However, I always liked the beam blades that came on one year of the Impala and wished they were used on newer models.
The beam blades did not load-up with ice or slush in the winter (I live in the Midwest) like the standard blades do. I never buy aftermarket blades, and have always bought OEM replacement blades due to their higher quality.
I don’t think you’ll go wrong with the beam blades - and I suspect they fit all models of the 8th generation Impala.