I beleive the ribbed hose is correct for 67-69 FGF, If I remember correctly (had a 68 RS/SS conv. Camaro) the Camaros used the GM stamped hose on all 67-69.

Also, the small section of hose that connects the breather pipe from the valve cover to the lower ram air pan (where the breather pipe connects to the white PVC breather that sits inside the lower ram air pan) also uses a very short piece of ribbed hose to connect the two.

I learned about all of the above at the 2008 Ecklers AACA Camaro/Firebird AACA Nationals when our Bird won it's Jr. Award. I had the ribbed hose for the heater but not on the breather pipe. So when the judges walked away I removed one of the heater hoses, whacked off 2" and stuck it on the breather, hooked everything back up and got back just enough points to earn the award. LOL