http://www.ebay.co.uk/itm/VW-Type-3...046433?hash=item3615077da1:g:m4AAAOSwc-tY1B8j It says T25 but they look pretty similar to the ones on my type 4 engine
They are fitted within the fan shroud if you have a type 4 engine but loads had them removed for no good reason. If yours don't have them and you are interested in getting a set you will soon find that they are rather hard to source