Found a Renntech backrest/rack on eBay for a good price. One of the best looking available (or the least ugly anyway).
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250735071219&ssPageName=STRK:MEWAX:IT
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250735071219&ssPageName=STRK:MEWAX:IT