Rear disc brake conversion says its for a II. This is just an FYI for those looking to make the switch. I have no connection with this auction.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33564&item=2457550742
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33564&item=2457550742