Thats fair enough, however generally speaking, when dealing with manufacturers you will find they wont be interested in talking to you for several reasons. Koni probably buy them in batchs of 1000 or something, and your local guy there being a Koni dealer may not even know who the actual manufacturer is.
If you do find your manufacturer you may discover they will only talk to you if you buy a minimum 100 or 200 sleeves, but then you'll have to find 50-100 people to go into it with you, if you follow what I mean Sometimes certain ventures just arent worth the effort expended