Mike,
I wouldn't get too obsessive with orange drop caps in this circuit.....after all, I don't see any in the original design and nor do I think that one capacitor is going to make the whole world of difference here.
Try something like this instead:
http://de.mouser.com/ProductDetail/WIMA/MKS4D031502B00JSSD/?qs=sGAEpiMZZMukHu%252bjC5l7Ya09z%252bPFYd21kgemswpfubg%3d
Paul