I think the bolt goes straight through the elastomer.
You might be shocked.... I think they are around £100 for the pair.
There is quite a comprehensive trailer resto thread here:
http://forum.earlybay.com/viewtopic.php?f=1&t=11064" onclick="window.open(this.href);return false;
and on Westfalia Register
http://translate.googleusercontent.com/translate_c?hl=en&sl=nl&u=http://www.vwbusclub.nl/WESTFALIA/ARTIKELEN/westfalia-aanhanger.htm&prev=/search%3Fq%3Drolf%2Bde%2Bkam%26hl%3Den%26client%3Dsafari%26rls%3Den&rurl=translate.google.co.uk&twu=1&usg=ALkJrhiyX51eEiKGxOX3tNyEFnn_sm4nGQ" onclick="window.open(this.href);return false;
Correct stickers can be got from Rolf De Kam
http://translate.google.co.uk/translate?hl=en&sl=nl&u=http://www.vwbusclub.nl/WESTFALIA/westfalia-onderdelen.htm&ei=sxDnS9L-HYOj_ga74OjtAw&sa=X&oi=translate&ct=result&resnum=2&ved=0CCAQ7gEwAQ&prev=/search%3Fq%3Drolf%2Bde%2Bkam%26hl%3Den%26client%3Dsafari%26rls%3Den" onclick="window.open(this.href);return false;
You'll want a large westfalia sticker, just email him what you need. It goes on the rear. He can also put you onto the elastomers.
Also, don't varnish it..... it should have teak oil!