You would think as it's quite common that someone would supply them. I'll have a look aroundYour probably best to find the size and try and match a normal o ring for it..
I seen that. However that's in the states and i need one like now lolI would think an aftermarket parts shop should have them. A quick Google search came up with this: http://www.summitracing.com/search/part-type/oil-filter-adapter-replacement-o-rings