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The asking price includes shipping... but I don't take PayPal (long story, short version reads: they owe me $600), so you'll have to send a money order.
As for leaks, I have no idea... I got these along with some other parts in a package deal. I have a 2000 T4R and they don't fit, so I never used or installed them. I would suggest that you replace the gaskets or re-use the existing gasket upon install.
Thanks for the inquiry.