AC Delco has several different lines, so be sure to get the OEM line. I ordered the "Advantage" beam wipers from Rock Auto for my Vibe, and they contacted each other when installed. I was past the return window, so I had to run one new and one old together.
The Advantage also didn't wipe for anything in this application, so I finally ordered an new pair of OEMs from an online GM supplier. They're just like the originals, and wipe perfectly. (The AC Delco rear blade for this car looks just like the Trico Exact Fit from Advance, but nothing local looks like the front ones.)