Fuel line spring clamps

[Old n' slow]

Redoing my fuel lines and adding an electric fuel cut off switch....looking at spring clamps to replace my screw clamps.....our braided hose is about 9mm maybe 9 1/2mm outside......should I get 8mm, 9mm or 10mm inside spring clamps ?
Or should I not even consider spring clamps on a car, I've only used them on motorcycles and mini bikes before. Thanks.
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Currently own : 1969 Beetle w/ 1600cc, Single Port, Solex 30 PICT 2, Dist. 113 905 205 T, stock exhaust.
All my daily drivers gone but not forgotten;

1964(sunroof)1967 & (2)1968 Beetles , 1968 Squareback , 1963 (23 window )Deluxe Sunroof Bus , 1969 Westphalia camper, 1974 Dasher , 1985 Vanagon , (2) 1981 Rabbit Diesels & a 1991 Jetta Diesel .

[Multi69s]

Remember our bike's fuel lines aren't pressurized, unless its a modern fuel injected bike. So the spring clips work fine to hold the fuel line on, plus they are in a position that we can see if they come off. For our VWs I would stick with some sort of screw clamp style.
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69 road Bug 2110
73 Squareback - 2L, T4, Automatic W/ AC
Gone, but many fond memories 69 Baja Bug 2010 - 5 Rib Bus Transaxle
Gone but not forgotten 72 Baja Bug 2010
My builds
T4 into Squareback http://www.thesamba.com/vw/forum/viewtopic.php?t=458944&highlight=
Auto Trans Rebuild http://www.thesamba.com/vw/forum/viewtopic.php?t=516066&highlight=
AC in Squareback https://www.thesamba.com/vw/forum/viewtopic.php?t=...highlight=