My brother swears by O'Reilley's, Autozone by me is decent. Never seen a Smyth. I live in northwest Indiana. There is a NAPA about 20 min away I used to work at. Last time I was there (5-7 years ago) they were still good. They always delt with a lot of commercial garages and a lot of heavy truck parts, I will swing by and see if anyone has a clue after I check out O'Reilley's.