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IIRC, they are 5/16 and 3/8 but it's been a while since I did anything with the fuel line. The lined hoses that I bought had a 309 and 306 number but again, that's from memory and my memory's not as good as it should be. 
BIIIIG +1 on that, had a 30R7 spring a leak on me, small split in the hose, was spraying all over the engine bay. Would have burned the whole car down if it would ignited, it was a fine spray that was everywhere. Just plain dumb luck it go up in flames.Bob Lincoln said:Be sure to use SAE rating of 30R9 or 100R6 for all hoses. 30R6 and 30R7 are common offerings, but are inadequate for fuel injection pressures.