Hello - need help on choosing the correct vendor for upper door window channels - being a "do it once and do it right guy" I'm going to install stainless steel ventshades and figured I should have new window channels on hand since you need to lower the upper portion to get the ventshades clips under them - we all know that we touch one thing a lot of times another thing breaks - so I'm being prepared on replacing the old if required. Do you guys have a good source for window channels that "fit" out of the box? We all have "aftermarket nightmares" - - just trying to get the job done the right way with the least amount of problems. Thank You, Cliff