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Where have you looked so far? Most parts houses would have access to these. I have a shop and service manual at my shop which should have a part number, but I won't be there until tomorrow. I am adding a link to one site that has these. I will keep looking for some others. http://www.jcwhitney.com/cv-joints-shafts-and-boots/renault/c3650m75j1s19.jcwx
I am adding another site for you............ http://www.rockauto.com/catalog/raframecatalog.php?carcode=949552&parttype=2284&a=www.bing.com%2BSearch%2Bfor%2B1989%2BRENAULT%2BTRAFIC%2B2.2L%2BL4%2BDrivetrain%2BCV%2BJoint%2BBoot&blanktemplate=true
IF nobody else comes up with anything for you try this site........and please let me know who had them. Thanks! http://www.autovillage.co.uk/car-parts/renault/part/cv-joint