For the 549s I use #6 red trebles, either Eagle Claw Lazer Sharp 3X size 6 or if I can find them, Matzou red sickle trebles in #6. I get the Eagle Claws from my local WalMart in 20 packs if they have them.

For the bigger C55s, I use #4 Matzuo sickle trebles, all red all the time if I can find them. If not, again the Eagle Claws red in #4.