this guy did a great job on these uprights and the price is reasonable . looks like he has a few and will most likely put more up in the future.
link to uprights with 3rd roller
http://cgi.ebay.com/ws/eBayISAPI.dll...713422033&rd=1
Link to dryer stands without 3rd roller
http://cgi.ebay.com/ws/eBayISAPI.dll...6&category=384