Kris,
"Dude, won't they be too long? what about the width? is that right? the D's blades seem thinner, it might be me, but I'll check them out again when I get home.""
The F model used the D model tailboom. As such, the rotor was 48 ft with a 21 inch chord, exactly the same as a D model.
"Do you have any information for those blades for the C from Cobra?"
It's listed as "540 rotor replacement." Check here: http://www.cobracompany.com/72014.htm
I have multiples of every 1/72 Huey kit made. If you want one in particular, send me a e-mail and we'll work something out.
Ray