K-4 Pacific 4-6-2 Steam Loco

[rudykizuty]

I have a Spectrum K-4 loco that came in a set with 22" radius curves. However, the set contained no turnouts. The tender of my K-4 always derails when trying to negotiate the standard sized LH and RH turnouts. 

Which of Bachmann's  turnouts would serve best for this particular loco? The no. 5 or no. 6 turnouts? Thanks.