2002 Blazer LS.

Driver side windshield wiper wasn't 'wiping' properly, leaving all the water on the windshield during a wipe. I replaced the wipers but the problem still existed. Passenger side wipes fine.

So I removed the cover on the lower part of the arm and removed the bolt. The splines are worn on the arm for sure, and I'm guessing where the arm attaches to the motor itself so I want to replace both. I want to make sure I get the right part. This is what I was looking at getting:
http://www.carpartsdiscount.com/auto...tml?3593=47472

I'm having trouble finding the arm though. I think this one will work http://www.rockauto.com/catalog/moreinfo.php?pk=1027894

Will these parts work? Thanks!