Egr cooler leaking externally?

[Nilao]

Lots of corrosion at the gasket mating surfaces. Called around and cummins doesn't have it, can't get it, and says the manufacturer has 0 in inventory. Spent several hours polishing by hand to remove as much as possible. I will use some anaerobic sealer to help seal the imperfections I can't get out. The oil cooler is an updated stainless steel version and it shows no signs of wear. I'm gambling it will not leak and reinstalling it with new o-rings. Found some online but they are not for my cpl number. I'm not sure if a different cpl cooler will work the same or not and I'm not willing to chance it. Will be getting new gaskets from cummins tomorrow.