90 degree adapter leak

I use KW Coppercoat on those gaskets with good luck. Better heat transfer than others I've used and cleanup is easier. I've had no problem getting the gaskets from the dealer. Make sure ALL of the old gasket is removed before intalling the new one. Don't get carried away tightening the bolt. They break easier than you would think! You can also warp the adapter. (especially if some knuckhead has installed two of the large gaskets sometime in the past)
Mark