Hatch Seals

[allyfiji]

As the rainy season approaches I'd like to address my incredibly leaky lewmar hatches with something other than my traditional gaffa tape. I think they're well passed the stage of lanolin. Anyone had success with replacement hatch seals and how the heck does the lewmar hatch sizing specs work?  I've got 8 leaky 69cm x 24cm (lose measurements) and 2 leaky 56 x 56 cm. She's a 2005 Bavaria 50 cruiser.