Yep, same here
Although some of the brackets are different so this may be your problem.
Part no's etc here
http://www.gastric.com/toys/ducatibip2mono.htm#1 IIRC the bare minimum you need is
827.1.120.1A Plate
713.1.109.1A Spacers x2
779.5.009.1A Screws for spacer above x2
The rest you can swap across.
Any dealer should know what you need as I'd guess this is one of the most common conversions going....