Found this thread using the search function, and I'm kinda glad I did... went with one of those universal types @ Canadian Tire, spent 22 bucks for it just to have it blow right off the the wiper arm @ 80km/h. Not fun when you're stuck behind a Mack truck bathing your car windshield in road grime.
Was able to find the inserts at my local Nissan for 14$, at least I know it'll stay on my car now... wish I had stumbled on this topic earlier.
BTW, anyone with a 03-05 G35 Sedan having problems putting their wipers on can find assistance here:
http://www.streakfreewiperblad...84988/
Here's a video for people really having troubles with it:
http://www.wonderhowto.com/how...38566/
Just figured I'd pass along for the next person to perform this search. Good luck.