Alert Alert!
The Mk2 UT is based on the Tipo engine. The toothed belts are different from the X1/9 1300/1500.
Giancarlo, I forgot to ask you whether you had looked for Fiat Tipo 1.4/1.6 toothed belts. If you still cannot get one, I can send you one.
However, have you joined up at Turbo124 yet???
http://www.turbo124.com/forum/index.php
I keep banging on about it - there is a wealth of Oz/Kiwi Fiat knowledge there. I am sure you will be able to source the right parts if you ask for advice there.
Cheers R