This one has moved around and had a few new owners lately. Up for sale again at Mecum in Indy.
https://www.mecum.com/lots/1112911/1971-chevrolet-monte-carlo-coupe/?aa_id=559922-0&utm_campaign=SC24&utm_medium=email&_hsmi=299475989&_hsenc=p2ANqtz--v7bcWeiAHHD9hPkAnzVLTvSKGYDLT2X_PygW4ZKXjkONeyUAu7ToxWEXNOPvDbqDm9cYn9Rt3WFiqCo-UfsbcydiyOw&utm_content=299475989&utm_source=hs_email
I have replaced 4/5 sets over the years and have only used the ones from The Parts Place as they are made for our Monte's. The fit and finish is great.
I am no expert, but I believe only the 70 model year has the v notch. 71 lowers had the bigger cut out, the same as the top on the 71 SS. I have two 71 that have never been restored nor painted, one with 29,000 original miles. They both have the bigger cut out on the bottom trim piece.