Hi Desmo_PT,
don't know if you're still looking for the crankcase breather but I have one for sale on ebay at the moment and just saw your post.
Let me know if you're interested. PM sent also.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=300426153424&ssPageNam e=STRK:MESELX:IT#ht_500wt_1182 Cheers, Tom.