if you would like to replace the steel saddle pillar and clamp one candidate for an alloy saddle pillar with integral clamp that would be both Italian and contemporaneous, without breaking the bank, would be a late type Nitor.
if unable to locate a 26.0mm example, a 26.2mm or 26.4mm could be used by reaming the seat tube to accomodate it.
http://velobase.com/ViewComponent.as...13dc9&Enum=105
please post again when Nurse Ratched has permitted you to complete the project. ;^D