Hello all I recently ordered larger tubing for my boat and I'd like to get my hands on some water grommets that will fit the larger size tubing. It's 8mm outer diameres with a 4mm inner diameter. All I can find is grommets with a 6.8mm inner diameter so I don't believe that is wide enough to let the new tubing through. I'd also really prefer them be black annodized aluminum for my scholor scheme I'll be painting my boat.