Thing is I don't actually know. I have had aero tubulars of that era with special washers so that was sort of a warning. Perhaps these would be ideal? http://cgi.ebay.com/Tubular-rim-nipp...QQcmdZViewItem

Also I have a wolber profile 20 (an there's one upstairs at bike doc. broadway)... I don't recall there being washers in the one I have. I'll go check it later today and report back.