I was at Murray's today and they only had 3 of the 4 Bosch filters I needed, so the guy working there offered to substitute a Fram Tough Guard instead of the Bosch, I appreciated the offer but told him I'd rather have the AC Delco (It's for a 2003 Chevy Malibu), even though it was 3 dollars cheaper. I wasn't sure if the Tough Guard's used the traditional cardboard endcaps and didn't want to gamble. If I remember right, AC Delco's are made by Champion Labs. It was a PF47. Did I make the right choice?