While doing a quick search on eBay, I came across these Boxster/996 rear suspension parts.....nice cast aluminum with the 5 bolt flange (with hubcentric ring) and bearings
Seems like it wouldn't be too difficult to use this as a base for making an aluminum or even a composite steel/aluminum trailing arm to help cut down on unsprung weight.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7961342148&category=42609&sspagename=WDVW
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