Rockauto has many many excellent prices on wiper blades that fit the factory arm. I see them from $1.50 each up. I'd recommend keeping with that as they are nice low profile arms.
Did this mod yesterday, they appeared to fit fine (but were a little loose), worked with great with a wet window. This AM leaving work I turned them on, nothing. Motor was on, the base was spinning and the arms didn't move. Going to use a set screw to make them work. Just thought I drag this one out of the archives for a good laugh. Damn Dorman arms.
Been using these for years and they fit perfect. Got them off a pickup at pick n pull. Chances are the actual gm ones are slightly different than what your getting new.
All 3 of mine, Ferrari and Lambo kits & V8, I used OEM arms, OEM passenger blade and 22/24 inch drivers side. Worked fine for years, wiped a much larger area.
OEM arms are the only way to go. It amazes me that this thread keeps costing new people money all the time.....By the time people spring for the 2 arms and the blades for them, its at least $50. I asked the original poster to put in a disclaimer in the first post saying that there is a good chance that the Dorman arms will not work, be he insists that all of us have installed the wiper arms incorrectly. No matter how many people have said they will not work for them. To this day, he refuses to warn anyone. I know he had good intentions, but this has cost a LOT of people time an money and not worked for them. He pops in this thread from time to time to tell everyone that the arms work perfectly, and we are all stupid, and do not know how to install wiper arms.