I have a really cool DUX sofa. It's got those rubber Fagas straps for seat support, but some of them are getting streched out. I found a company in California that still sells the straps. I haven't ordered any yet, but I will probably do so soon. If you are interested, their web site is: http://www.fagasstraps.com.
Yes, I have ordered them. The straps are wonderful. Prompt service and my chairs now are PERFECT. Do not hesitate for order the fagas straps from fagasstraps.com. It is a coincidence actually that I live in Malibu, as well. I had the straps sent to my office in Santa Monica. It has given the chairs support and comfort.