CB Performance sells parts and linkages for the Dellorto.
http://www.cbperformance.com/category.asp?CategoryID=6
http://www.cbperformance.com/catalog.asp?ProductID=595
There is an update kit for them too
http://www.cbperformance.com/catalog.asp?ProductID=522
(And now for the webbers also)
http://www.cbperformance.com/catalog.asp?ProductID=508
That changes to a horizantal discharge tube from the venturi.
It also put the idle jet in a stack up off the floor of the carb.
It adds power and inproves the midrange transition from idle to main. It
allowed me to go to a smaller main jet, that i had to run to overcome the
hesitation off idle.
Robert