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Oring is on the outside, the seal is on the inside Matt.
HI,Thanks for you reply and looking for spares.The exisitng seal Looks OK, maybe just wear on the lip and as you say it has a longish lip.Yes it does seem to be a steel backed version.I remember seeing ads for a Goo you added to engine oil to swell engine oil seals on older engines. Does it work and would just painting it on the seal lips add that little bit extra to seal?