ray
go

compare your ''walker'' oil filter element to a FRAM C3P Filter element, size & diameter and see if what you find is close to what i suggested.
http://images.google.com/imgres?imgurl=http://www.356registry.org/tech/images/oil_filter_cans/PreA_filter.jpg&imgrefurl=http://www.356registry.org/tech/oil_can_types_and_decals.html&h=400&w=500&sz=55&hl=en&start=1&um=1&usg=__JvBAWxOR0Py8sCsIOl6eCbh-QjA=&tbnid=9bE_0nZJjwMyKM:&tbnh=104&tbnw=130&prev=/images%3Fq%3Dporsche%2B356%2Boil%2Bfilter%2Bcannister%26um%3D1%26hl%3Den%26client%3Dsafari%26rls%3Den%26sa%3DG
good luck
Ps they have 356's in the UK