As many of you know, I am building a ported Tempest based on the SBB4 design. I finally have enough cash to buy the Tempest. I have been unable to find dual terminal cups around my area but I found them at creativesound.ca. Is there any reason not to simply order them along with my Tempest? Dual input cap at creativesound.ca In the picture it seems as if the binding posts are missing something? Am I correct?