Fixing bumpers from Fiat Ducato is almost identical to the Peugeot Boxer and Citroën Jumper.

See:

How to remove front and rear bumper Peugeot Boxer (Citroën Jumper, Fiat Ducato) (1994-2006)

How to remove front and rear bumper Peugeot Boxer (Citroën Jumper, Fiat Ducato) (since 2006)