Most can type electrolytics are marked with some sort of polarity marker. Sometimes the minus sign is kinda hidden in the stripe. Where did these caps come from?
Generally all epoxy cased transistors with a flat spot on their rim have the emitter at the flat spot. As for the TO-92 half flat case, the pinout could be anything, EBC, ECB, CBE, etc. Sometimes the pinout is molded right into the case in small letters.
And yes, the 2N5089 should work fine in the Kustom preamp.