364282 Zen Cart Related Products AS 2

I need a module installed for Zen Cart that will relate products to each other but not on a 1:1 basis. So one product is related to another but not necassarily that product is related to the other. A Screwdriver has a case related to it but a case has nothing related to it. A Desk has a Chair related to it but a Chair has a cover related to it and not the desk. Please bid if you know exactly what I mean. Currently I have a 1:1 realtionship installed. The relations manager should make the products show in the "related products" pane below the products details page. Regards