I don't think a semi will give the same results
Here you go:http://cgi.ebay.co.uk/VW-GOLF-MK2-GTI-DIGIFANT-KJET-ENGINE-BREATHER-GROMMET_W0QQitemZ130134673061QQihZ003QQcategoryZ9889QQssPageNameZWDVWQQrdZ1QQcmdZViewItemruns a LOT better with a new one in, but by golly they're tough to get in when new (lube needed )