Proboat does not sell the stock liners separate from the flex cables. I recall one of the European members here searching for an identical size replacement and he found something, but I can't find that post. If your replacement fits too loosely in brass stuffing tube, you can shim it with a small lengths of brass tube one size smaller that what's installed in the hull already. I've also wrapped liners with teflon plumbers tape to get a tighter fit.