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2nd the mercury fittings.

i dont know what bayonet style is, but i (my brother) have a 2001 merc 40hp.

they are tough feeling, like if i dropped them they wouldnt break. they are so snug, and have never had an issue. nor with the originals on my usta-whaler powered by a 1996 merc 150 offshore.

original gas tank and original fuel line parts on that.

the fittings are solid, original.

i have some non oem johnson fittings, think they are moeller, and they feel like garbage, i can't comment on oem omc.