Westfalia sink foam seal - what to use?

hi all, I have been cleaning out a rather manky water tank in my original Westy interior, and had removed the sink in order to get it out. All is cleaned, but I need to find something to replace the perished foam seal that sits under the sink rim. What should I use? Thanks in advance

 

Easy way would be to run a bead of clear silicone around the top edge of the hole that the sink sits in, then just lower the sink gently onto it. Remove the excess with a bit of kitchen roll. Job done...sink stuck in place and a watertight seal underneath too.

 

Smev have a rubber seal, which would work.

 

This sort of thing, I used one

http://pages.ebay.com/link/?nav=item.view&alt=web&id=181545199521

 

Thanks both good suggestions. Cheers!