These guys have nice stuff. I use their 3 place separators in black. 4 each will do you, 2 on each set of 3 wires to the 2 sides of the motor. IME it isn't necessary to "bolt" the wires to anything, they are "self supporting".
I do the same. Ive had the same wires together for seven years now. They stay exactly the way they should. The best thing about it is the cost. About $0.15 per seperator. :wink: