Plastic end stoppers for Aquadart shower door?

I found an online e-mail contact address for Aquadart, but my mail was returned undeliverable. Does anyone know of a supplier for the small stoppers for bars on inward opening Aquadart shower doors, which operate from two arms allowing the door to swing in a slightly circular motion. The stoppers are triangular with one very acute angle, and are to prevent entry of water into the bars. The plastic degenerates and falls apart in the end. I have moved the top two on to the bottom bar, but they will probably break up soon. If the comments re the sealing strips on these doors is anything to go by, maybe I am barking up the wrong tree, but someone must have taken their spares when Aquadart went bust. Where are you???