j.hoTheir source (who I assume is Qtan) doesn't sell the MX Clear versions of the 660M with those nicer dye sub caps. Any previous attempts to request this combo on the GeekHack forums have been met with a reply simply stating "No". I have no clue why this restriction is being enforced, but I do know that you can buy Leopold's official dye sub cap set by itself and replace the stock caps (which is what I intend to do). They cost 50 bucks +shipping from Qtan's website