Last I heard, it was:

A) Naturally the standard configuration is red, white and blue.

B) All red spacers (an option, but not chargeable and can be ordered on any Randall that the red, white and blue could be ordered on).

C) All black spacers (Same rules apply as "B")

D) Brass spacers (with "black" is the standard configuration, unless otherwise requested)

E) Brass spacers (with "red", upon request)

F) Aluminum spacers (again: with "black" unless otherwise requested)

G) Aluminum spacers (with "red" : Same rules apply as "F")

(If wrong, maybe Capt. Chris will correct.)