Sorry, didn't mean to imply that I was bothered, got a nice deal, and was just thinking of purchasing the newer part, but needed to verify that 520-514 was the right part... Ralph told me that the older grips could also be modified with a drill press, but my skills might be a little lacking there (I have been know to damage items when I try to modify), so wanted to make sure I had a backup plan!
I am a firm believer in when you purchased a used heli, you'll always need/want to change a few things out to make it exactly like you want it... The second owner of this one didn't like all 4 of the quick releases, I tend to like them - ordered 2, etc.