[patrickt]

Here are two more shots. I honestly can not tell whether that additional piece is part of the tank or a separate spacer, but I think it's part of the tank. I don't see any gasket/sealer material anywhere around the tank side of where it would be if it was a spacer. If your tank doesn't look like this, I think you need to give Bob P. your credit card number and tell him you want what I have. Tell him "price is no object."