Black diamond rubber doesn’t have soft rubber that fits a sorbo channel. They have one type of rubber for sorbo, and it is a medium rubber. We found it required too much pressure to not leave water on the glass. The sorbo and black diamond soft rubbers are more forgiving, but not too soft where they start folding on you. Black diamond and sorbo precut last a good amount of time. The bulk sorbo rubber is junk. Works great for a day then to the rubbish. We are switching to legend channels just so we can use black diamond soft rubber, and we are experimenting with the facelift rubber, but the price on that is overpriced at WCR. We found it on eBay and at a local shop.
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