Ultimate (9 sp dura ace) and a Classic(8sp dura ace). Both have "braze on" front der mounts.
Not to belabor my question but are you sure the frames actually have a welded on front derailleur tab on the seat tube or are they clamp-on adapters that use a "braze-on" type front derailleur. As I noted, none of my Litespeed frames (1996 Catalyst, 2005 Firenza and 2006 Tuscany) or my son-in-law's 2002 Classic have welded-on tabs but use clamp-on adapters to mount braze-on type front derailleurs.
My reason for questioning this is that if the bike really has a clamp-on adapter, it can be adjusted as low as needed to match smaller chainrings while a true welded/brazed on mounting tab may limit the adjustability.